diff --git a/src/components/animationIntersector.ts b/src/components/animationIntersector.ts
index 278518d2..585c4de8 100644
--- a/src/components/animationIntersector.ts
+++ b/src/components/animationIntersector.ts
@@ -6,7 +6,7 @@
 
 import { RLottiePlayer } from "../lib/lottieLoader";
 import rootScope from "../lib/rootScope";
-import { isSafari } from "../helpers/userAgent";
+import { IS_SAFARI } from "../environment/userAgent";
 import { MOUNT_CLASS_TO } from "../config/debug";
 import isInDOM from "../helpers/dom/isInDOM";
 
@@ -93,7 +93,7 @@ export class AnimationIntersector {
     const {el, animation} = player;
     animation.remove();
 
-    if(animation instanceof HTMLVideoElement && isSafari) {
+    if(animation instanceof HTMLVideoElement && IS_SAFARI) {
       setTimeout(() => { // TODO: очистка по очереди, а не все вместе с этим таймаутом
         animation.src = '';
         animation.load();
diff --git a/src/components/appMediaPlaybackController.ts b/src/components/appMediaPlaybackController.ts
index c59c5afe..f79a53b9 100644
--- a/src/components/appMediaPlaybackController.ts
+++ b/src/components/appMediaPlaybackController.ts
@@ -8,7 +8,7 @@ import rootScope from "../lib/rootScope";
 import appMessagesManager from "../lib/appManagers/appMessagesManager";
 import appDocsManager, {MyDocument} from "../lib/appManagers/appDocsManager";
 import { CancellablePromise, deferredPromise } from "../helpers/cancellablePromise";
-import { isApple, isSafari } from "../helpers/userAgent";
+import { IS_APPLE, IS_SAFARI } from "../environment/userAgent";
 import { MOUNT_CLASS_TO } from "../config/debug";
 import appDownloadManager from "../lib/appManagers/appDownloadManager";
 import simulateEvent from "../helpers/dom/dispatchEvent";
@@ -16,7 +16,7 @@ import type { SearchSuperContext } from "./appSearchSuper.";
 import { copy, deepEqual } from "../helpers/object";
 import { DocumentAttribute, Message, MessageMedia, PhotoSize } from "../layer";
 import appPhotosManager from "../lib/appManagers/appPhotosManager";
-import { isTouchSupported } from "../helpers/touchSupport";
+import { IS_TOUCH_SUPPORTED } from "../environment/touchSupport";
 import appAvatarsManager from "../lib/appManagers/appAvatarsManager";
 import appPeersManager from "../lib/appManagers/appPeersManager";
 import I18n from "../lib/langPack";
@@ -34,7 +34,7 @@ type HTMLMediaElement = HTMLAudioElement | HTMLVideoElement;
 
 const SHOULD_USE_SAFARI_FIX = (() => {
   try {
-    return isSafari && +navigator.userAgent.match(/ Version\/(\d+)/)[1] < 14;
+    return IS_SAFARI && +navigator.userAgent.match(/ Version\/(\d+)/)[1] < 14;
   } catch(err) {
     return false;
   }
@@ -296,8 +296,8 @@ class AppMediaPlaybackController {
     }
 
     if(!artwork.length) {
-      if(isApple) {
-        if(isTouchSupported) {
+      if(IS_APPLE) {
+        if(IS_TOUCH_SUPPORTED) {
           artwork.push({
             src: `assets/img/apple-touch-icon-precomposed.png`,
             sizes: '180x180',
diff --git a/src/components/appMediaViewer.ts b/src/components/appMediaViewer.ts
index eec0b660..db3500b6 100644
--- a/src/components/appMediaViewer.ts
+++ b/src/components/appMediaViewer.ts
@@ -6,8 +6,8 @@
 
 import { deferredPromise } from "../helpers/cancellablePromise";
 import mediaSizes from "../helpers/mediaSizes";
-import { isTouchSupported } from "../helpers/touchSupport";
-import { isMobileSafari, isSafari } from "../helpers/userAgent";
+import { IS_TOUCH_SUPPORTED } from "../environment/touchSupport";
+import { IS_MOBILE_SAFARI, IS_SAFARI } from "../environment/userAgent";
 import appDocsManager, { MyDocument } from "../lib/appManagers/appDocsManager";
 import appImManager from "../lib/appManagers/appImManager";
 import appMessagesManager from "../lib/appManagers/appMessagesManager";
@@ -52,6 +52,7 @@ import PopupDeleteMessages from "./popups/deleteMessages";
 import RangeSelector from "./rangeSelector";
 import windowSize from "../helpers/windowSize";
 import ListLoader, { ListLoaderOptions } from "../helpers/listLoader";
+import MEDIA_MIME_TYPES_SUPPORTED from "../environment/mediaMimeTypesSupport";
 
 const ZOOM_STEP = 0.5;
 const ZOOM_INITIAL_VALUE = 1;
@@ -355,7 +356,7 @@ class AppMediaViewerBase<ContentAdditionType extends string, ButtonsAdditionType
       else this.onPrevClick(item);
     };
 
-    if(isTouchSupported) {
+    if(IS_TOUCH_SUPPORTED) {
       const swipeHandler = new SwipeHandler({
         element: this.wholeDiv, 
         onSwipe: (xDiff, yDiff) => {
@@ -530,7 +531,7 @@ class AppMediaViewerBase<ContentAdditionType extends string, ButtonsAdditionType
     if(target.tagName === 'A') return;
     cancelEvent(e);
 
-    if(isTouchSupported) {
+    if(IS_TOUCH_SUPPORTED) {
       if(this.highlightSwitchersTimeout) {
         clearTimeout(this.highlightSwitchersTimeout);
       } else {
@@ -1295,7 +1296,7 @@ class AppMediaViewerBase<ContentAdditionType extends string, ButtonsAdditionType
     } else {
       window.addEventListener('keydown', this.onKeyDown);
       window.addEventListener('keyup', this.onKeyUp);
-      if(!isTouchSupported) window.addEventListener('wheel', this.onWheel, {passive: false, capture: true});
+      if(!IS_TOUCH_SUPPORTED) window.addEventListener('wheel', this.onWheel, {passive: false, capture: true});
       const mainColumns = this.pageEl.querySelector('#main-columns');
       this.pageEl.insertBefore(this.wholeDiv, mainColumns);
       void this.wholeDiv.offsetLeft; // reflow
@@ -1303,7 +1304,7 @@ class AppMediaViewerBase<ContentAdditionType extends string, ButtonsAdditionType
       rootScope.isOverlayActive = true;
       animationIntersector.checkAnimations(true);
 
-      if(!isMobileSafari) {
+      if(!IS_MOBILE_SAFARI) {
         appNavigationController.pushItem({
           type: 'media',
           onPop: (canAnimate) => {
@@ -1401,7 +1402,7 @@ class AppMediaViewerBase<ContentAdditionType extends string, ButtonsAdditionType
           }
         }, {once: true});
   
-        if(isSafari) {
+        if(IS_SAFARI) {
           // test stream
           // video.controls = true;
           video.autoplay = true;
@@ -1851,7 +1852,7 @@ export default class AppMediaViewer extends AppMediaViewerBase<'caption', 'delet
   }
 
   public static isMediaCompatibleForDocumentViewer(media: MyPhoto | MyDocument) {
-    return media._ === 'photo' || (['photo', 'video', 'gif'].includes(media.type) || media.mime_type.indexOf('video/') === 0);
+    return media._ === 'photo' || MEDIA_MIME_TYPES_SUPPORTED.has(media.mime_type);
   }
 }
 
diff --git a/src/components/appNavigationController.ts b/src/components/appNavigationController.ts
index 97012cde..45291d0b 100644
--- a/src/components/appNavigationController.ts
+++ b/src/components/appNavigationController.ts
@@ -5,7 +5,7 @@
  */
 
 import { MOUNT_CLASS_TO } from "../config/debug";
-import { isMobileSafari } from "../helpers/userAgent";
+import { IS_MOBILE_SAFARI } from "../environment/userAgent";
 import { logger } from "../lib/logger";
 import { doubleRaf } from "../helpers/schedulers";
 import blurActiveElement from "../helpers/dom/blurActiveElement";
@@ -67,7 +67,7 @@ export class AppNavigationController {
       }
     }, {capture: true, passive: false});
 
-    if(isMobileSafari) {
+    if(IS_MOBILE_SAFARI) {
       const options = {passive: true};
       window.addEventListener('touchstart', (e) => {
         if(e.touches.length > 1) return;
diff --git a/src/components/appSearchSuper..ts b/src/components/appSearchSuper..ts
index 49fd15d8..bcc87b4b 100644
--- a/src/components/appSearchSuper..ts
+++ b/src/components/appSearchSuper..ts
@@ -38,7 +38,7 @@ import mediaSizes from "../helpers/mediaSizes";
 import appImManager from "../lib/appManagers/appImManager";
 import positionElementByIndex from "../helpers/dom/positionElementByIndex";
 import cleanSearchText from "../helpers/cleanSearchText";
-import { isTouchSupported } from "../helpers/touchSupport";
+import { IS_TOUCH_SUPPORTED } from "../environment/touchSupport";
 import handleTabSwipe from "../helpers/dom/handleTabSwipe";
 import windowSize from "../helpers/windowSize";
 import { formatPhoneNumber } from "../helpers/formatPhoneNumber";
@@ -133,7 +133,7 @@ class SearchContextMenu {
       });
     };
 
-    if(isTouchSupported) {
+    if(IS_TOUCH_SUPPORTED) {
 
     } else {
       attachContextMenuListener(attachTo, onContextMenu as any);
@@ -326,7 +326,7 @@ export default class AppSearchSuper {
     this.tabsContainer = document.createElement('div');
     this.tabsContainer.classList.add('search-super-tabs-container', 'tabs-container');
 
-    if(isTouchSupported) {
+    if(IS_TOUCH_SUPPORTED) {
       handleTabSwipe(this.tabsContainer, (next) => {
         const prevId = this.selectTab.prevId();
         this.selectTab(next ? prevId + 1 : prevId - 1);
diff --git a/src/components/audio.ts b/src/components/audio.ts
index 1b392086..bc773f13 100644
--- a/src/components/audio.ts
+++ b/src/components/audio.ts
@@ -12,7 +12,7 @@ import { MediaProgressLine } from "../lib/mediaPlayer";
 import appMediaPlaybackController, { MediaItem } from "./appMediaPlaybackController";
 import { DocumentAttribute } from "../layer";
 import mediaSizes from "../helpers/mediaSizes";
-import { isSafari } from "../helpers/userAgent";
+import { IS_SAFARI } from "../environment/userAgent";
 import appMessagesManager from "../lib/appManagers/appMessagesManager";
 import rootScope from "../lib/rootScope";
 import './middleEllipsis';
@@ -558,7 +558,7 @@ export default class AudioElement extends HTMLElement {
             appMediaPlaybackController.resolveWaitingForLoadMedia(this.message.peerId, this.message.mid);
             appMediaPlaybackController.willBePlayed(this.audio); // prepare for loading audio
 
-            if(isSafari) {
+            if(IS_SAFARI) {
               this.audio.autoplay = true;
             }
 
diff --git a/src/components/chat/autocompleteHelper.ts b/src/components/chat/autocompleteHelper.ts
index 58e9fac8..272ac017 100644
--- a/src/components/chat/autocompleteHelper.ts
+++ b/src/components/chat/autocompleteHelper.ts
@@ -7,7 +7,7 @@
 import attachListNavigation from "../../helpers/dom/attachListNavigation";
 import EventListenerBase from "../../helpers/eventListenerBase";
 import { safeAssign } from "../../helpers/object";
-import { isMobile } from "../../helpers/userAgent";
+import { IS_MOBILE } from "../../environment/userAgent";
 import rootScope from "../../lib/rootScope";
 import appNavigationController, { NavigationItem } from "../appNavigationController";
 import SetTransition from "../singleTransition";
@@ -68,7 +68,7 @@ export default class AutocompleteHelper extends EventListenerBase<{
 
     this.detach = detach;
     this.resetTarget = resetTarget;
-    if(!isMobile && !this.navigationItem) {
+    if(!IS_MOBILE && !this.navigationItem) {
       this.navigationItem = {
         type: 'autocomplete-helper',
         onPop: () => {
diff --git a/src/components/chat/bubbles.ts b/src/components/chat/bubbles.ts
index 5dd0ad67..e55392ce 100644
--- a/src/components/chat/bubbles.ts
+++ b/src/components/chat/bubbles.ts
@@ -18,7 +18,7 @@ import type { AppMessagesIdsManager } from "../../lib/appManagers/appMessagesIds
 import type Chat from "./chat";
 import { CHAT_ANIMATION_GROUP } from "../../lib/appManagers/appImManager";
 import { getObjectKeysAndSort } from "../../helpers/object";
-import { isTouchSupported } from "../../helpers/touchSupport";
+import { IS_TOUCH_SUPPORTED } from "../../environment/touchSupport";
 import { logger } from "../../lib/logger";
 import rootScope, { BroadcastEvents } from "../../lib/rootScope";
 import AppMediaViewer from "../appMediaViewer";
@@ -32,7 +32,7 @@ import StickyIntersector from "../stickyIntersector";
 import animationIntersector from "../animationIntersector";
 import RichTextProcessor from "../../lib/richtextprocessor";
 import mediaSizes from "../../helpers/mediaSizes";
-import { isAndroid, isApple, isMobile, isSafari } from "../../helpers/userAgent";
+import { IS_ANDROID, IS_APPLE, IS_MOBILE, IS_SAFARI } from "../../environment/userAgent";
 import I18n, { i18n, langPack } from "../../lib/langPack";
 import AvatarElement from "../avatar";
 import { ripple } from "../ripple";
@@ -452,7 +452,7 @@ export default class ChatBubbles {
       });
     }
 
-    if(!isMobile) {
+    if(!IS_MOBILE) {
       this.listenerSetter.add(this.bubblesContainer)('dblclick', (e) => {
         if(this.chat.selection.isSelecting || 
           !this.appMessagesManager.canSendToPeer(this.peerId, this.chat.threadId)) {
@@ -864,7 +864,7 @@ export default class ChatBubbles {
       return;
     }
 
-    if(!isTouchSupported && findUpClassName(target, 'time')) {
+    if(!IS_TOUCH_SUPPORTED && findUpClassName(target, 'time')) {
       this.chat.selection.toggleByElement(bubble);
       return;
     }
@@ -878,7 +878,7 @@ export default class ChatBubbles {
       cancelEvent(e);
       //console.log('bubble click', e);
 
-      if(isTouchSupported && this.chat.selection.selectedText) {
+      if(IS_TOUCH_SUPPORTED && this.chat.selection.selectedText) {
         this.chat.selection.selectedText = undefined;
         return;
       }
@@ -1264,7 +1264,7 @@ export default class ChatBubbles {
     if(this.isHeavyAnimationInProgress && this.scrolledDown) return;
       //lottieLoader.checkAnimations(false, 'chat');
 
-    if(!isTouchSupported) {
+    if(!IS_TOUCH_SUPPORTED) {
       if(this.isScrollingTimeout) {
         clearTimeout(this.isScrollingTimeout);
       } else if(!this.chatInner.classList.contains('is-scrolling')) {
@@ -1313,7 +1313,7 @@ export default class ChatBubbles {
     this.scrollable.onScrolledBottom = () => this.loadMoreHistory(false);
     //this.scrollable.attachSentinels(undefined, 300);
 
-    if(isTouchSupported) {
+    if(IS_TOUCH_SUPPORTED) {
       this.scrollable.container.addEventListener('touchmove', () => {
         if(this.isScrollingTimeout) {
           clearTimeout(this.isScrollingTimeout);
@@ -2530,7 +2530,7 @@ export default class ChatBubbles {
             break;
           }
           
-          const withTail = !isAndroid && canHaveTail && !withReplies && USE_MEDIA_TAILS;
+          const withTail = !IS_ANDROID && canHaveTail && !withReplies && USE_MEDIA_TAILS;
           if(withTail) bubble.classList.add('with-media-tail');
           wrapPhoto({
             photo, 
@@ -2759,7 +2759,7 @@ export default class ChatBubbles {
                 noAutoDownload: this.chat.noAutoDownloadMedia,
               });
             } else {
-              const withTail = !isAndroid && !isApple && !isRound && canHaveTail && !withReplies && USE_MEDIA_TAILS;
+              const withTail = !IS_ANDROID && !IS_APPLE && !isRound && canHaveTail && !withReplies && USE_MEDIA_TAILS;
               if(withTail) bubble.classList.add('with-media-tail');
               wrapVideo({
                 doc, 
@@ -3198,7 +3198,7 @@ export default class ChatBubbles {
       //this.scrollable.scrollTop = this.scrollable.scrollHeight;
       //isTouchSupported && isApple && (this.scrollable.container.style.overflow = '');
 
-      if(isSafari/*  && !isAppleMobile */) { // * fix blinking and jumping
+      if(IS_SAFARI/*  && !isAppleMobile */) { // * fix blinking and jumping
         reflowScrollableElement(this.scrollable.container);
       }
 
@@ -3376,7 +3376,7 @@ export default class ChatBubbles {
 
         // ! в хроме, каким-то образом из-за zoom-fade класса начинает прыгать скролл при подгрузке сообщений вверх, 
         // ! т.е. скролл не ставится, так же, как в сафари при translateZ на блок выше scrollable
-        if(!isSafari) {
+        if(!IS_SAFARI) {
           this.needReflowScroll = true;
         }
       });
diff --git a/src/components/chat/contextMenu.ts b/src/components/chat/contextMenu.ts
index c24b9441..83a57330 100644
--- a/src/components/chat/contextMenu.ts
+++ b/src/components/chat/contextMenu.ts
@@ -10,7 +10,7 @@ import type { AppPollsManager, Poll } from "../../lib/appManagers/appPollsManage
 import type { AppDocsManager, MyDocument } from "../../lib/appManagers/appDocsManager";
 import type { AppMessagesIdsManager } from "../../lib/appManagers/appMessagesIdsManager";
 import type Chat from "./chat";
-import { isTouchSupported } from "../../helpers/touchSupport";
+import { IS_TOUCH_SUPPORTED } from "../../environment/touchSupport";
 import ButtonMenu, { ButtonMenuItemOptions } from "../buttonMenu";
 import { attachContextMenuListener, openBtnMenu, positionMenu } from "../misc";
 import PopupDeleteMessages from "../popups/deleteMessages";
@@ -117,7 +117,7 @@ export default class ChatContextMenu {
         if(chat.selection.isSelecting && !button.withSelection) {
           good = false;
         } else {
-          good = contentWrapper || isTouchSupported || true ? 
+          good = contentWrapper || IS_TOUCH_SUPPORTED || true ? 
             button.verify() : 
             button.notDirect && button.verify() && button.notDirect();
         }
@@ -135,7 +135,7 @@ export default class ChatContextMenu {
       });
     };
 
-    if(isTouchSupported/*  && false */) {
+    if(IS_TOUCH_SUPPORTED/*  && false */) {
       attachClickEvent(attachTo, (e) => {
         if(chat.selection.isSelecting) {
           return;
@@ -284,7 +284,7 @@ export default class ChatContextMenu {
         const doc: MyDocument = this.message.media?.document;
         if(!doc) return false;
         
-        let hasTarget = !!isTouchSupported;
+        let hasTarget = !!IS_TOUCH_SUPPORTED;
         const isGoodType = !doc.type || !(['gif', 'video', 'sticker'] as MyDocument['type'][]).includes(doc.type);
         if(isGoodType) hasTarget = hasTarget || !!findUpClassName(this.target, 'document') || !!findUpClassName(this.target, 'audio');
         return isGoodType && hasTarget;
diff --git a/src/components/chat/input.ts b/src/components/chat/input.ts
index 7fb74432..9c017252 100644
--- a/src/components/chat/input.ts
+++ b/src/components/chat/input.ts
@@ -19,7 +19,7 @@ import type { AppInlineBotsManager } from '../../lib/appManagers/appInlineBotsMa
 import type { AppMessagesIdsManager } from '../../lib/appManagers/appMessagesIdsManager';
 import type Chat from './chat';
 import Recorder from '../../../public/recorder.min';
-import { isTouchSupported } from "../../helpers/touchSupport";
+import { IS_TOUCH_SUPPORTED } from "../../environment/touchSupport";
 import apiManager from "../../lib/mtproto/mtprotoworker";
 //import Recorder from '../opus-recorder/dist/recorder.min';
 import opusDecodeController from "../../lib/opusDecodeController";
@@ -44,7 +44,7 @@ import rootScope from '../../lib/rootScope';
 import PopupPinMessage from '../popups/unpinMessage';
 import { tsNow } from '../../helpers/date';
 import appNavigationController, { NavigationItem } from '../appNavigationController';
-import { isMobile, isMobileSafari } from '../../helpers/userAgent';
+import { IS_MOBILE, IS_MOBILE_SAFARI } from '../../environment/userAgent';
 import I18n, { i18n, join, LangPackKey } from '../../lib/langPack';
 import { generateTail } from './bubbles';
 import findUpClassName from '../../helpers/dom/findUpClassName';
@@ -79,6 +79,7 @@ import PopupDeleteMessages from '../popups/deleteMessages';
 import fixSafariStickyInputFocusing, { IS_STICKY_INPUT_BUGGED } from '../../helpers/dom/fixSafariStickyInputFocusing';
 import { copy } from '../../helpers/object';
 import PopupPeer from '../popups/peer';
+import MEDIA_MIME_TYPES_SUPPORTED from '../../environment/mediaMimeTypesSupport';
 
 const RECORD_MIN_TIME = 500;
 const POSTING_MEDIA_NOT_ALLOWED = 'Posting media content isn\'t allowed in this group.';
@@ -331,9 +332,7 @@ export default class ChatInput {
         this.appImManager.openScheduled(this.chat.peerId);
       }, {listenerSetter: this.listenerSetter});
 
-      this.listenerSetter.add(rootScope)('scheduled_new', (e) => {
-        const peerId = e.peerId;
-
+      this.listenerSetter.add(rootScope)('scheduled_new', ({peerId}) => {
         if(this.chat.peerId !== peerId) {
           return;
         }
@@ -341,9 +340,7 @@ export default class ChatInput {
         this.btnScheduled.classList.remove('hide');
       });
 
-      this.listenerSetter.add(rootScope)('scheduled_delete', (e) => {
-        const peerId = e.peerId;
-
+      this.listenerSetter.add(rootScope)('scheduled_delete', ({peerId}) => {
         if(this.chat.peerId !== peerId) {
           return;
         }
@@ -370,7 +367,8 @@ export default class ChatInput {
       text: 'Chat.Input.Attach.PhotoOrVideo',
       onClick: () => {
         this.fileInput.value = '';
-        this.fileInput.setAttribute('accept', 'image/*, video/*');
+        const accept = [...MEDIA_MIME_TYPES_SUPPORTED].join(', ');
+        this.fileInput.setAttribute('accept', accept);
         this.willAttachType = 'media';
         this.fileInput.click();
       },
@@ -391,7 +389,7 @@ export default class ChatInput {
       onClick: () => {
         new PopupCreatePoll(this.chat).show();
       },
-      verify: (peerId, threadId) => this.appMessagesManager.canSendToPeer(peerId, threadId, 'send_polls') && peerId < 0
+      verify: (peerId, threadId) => peerId < 0 && this.appMessagesManager.canSendToPeer(peerId, threadId, 'send_polls')
     }];
 
     this.attachMenu = ButtonMenuToggle({noRipple: true, listenerSetter: this.listenerSetter}, 'top-left', this.attachMenuButtons);
@@ -491,8 +489,7 @@ export default class ChatInput {
       }
     });
 
-    this.listenerSetter.add(rootScope)('draft_updated', (e) => {
-      const {peerId, threadId, draft, force} = e;
+    this.listenerSetter.add(rootScope)('draft_updated', ({peerId, threadId, draft, force}) => {
       if(this.chat.threadId !== threadId || this.chat.peerId !== peerId) return;
       this.setDraft(draft, true, force);
     });
@@ -671,12 +668,12 @@ export default class ChatInput {
   };
 
   private onEmoticonsOpen = () => {
-    const toggleClass = isTouchSupported ? 'flip-icon' : 'active';
+    const toggleClass = IS_TOUCH_SUPPORTED ? 'flip-icon' : 'active';
     this.btnToggleEmoticons.classList.toggle(toggleClass, true);
   };
 
   private onEmoticonsClose = () => {
-    const toggleClass = isTouchSupported ? 'flip-icon' : 'active';
+    const toggleClass = IS_TOUCH_SUPPORTED ? 'flip-icon' : 'active';
     this.btnToggleEmoticons.classList.toggle(toggleClass, false);
   };
 
@@ -929,7 +926,7 @@ export default class ChatInput {
       }
     });
 
-    if(isTouchSupported) {
+    if(IS_TOUCH_SUPPORTED) {
       attachClickEvent(this.messageInput, (e) => {
         this.appImManager.selectTab(1); // * set chat tab for album orientation
         //this.saveScroll();
@@ -1619,7 +1616,7 @@ export default class ChatInput {
   };
 
   public clearInput(canSetDraft = true, fireEvent = true, clearValue = '') {
-    if(document.activeElement === this.messageInput && isMobileSafari) { // fix first char uppercase
+    if(document.activeElement === this.messageInput && IS_MOBILE_SAFARI) { // fix first char uppercase
       const i = document.createElement('input');
       document.body.append(i);
       fixSafariStickyInput(i);
@@ -1630,7 +1627,7 @@ export default class ChatInput {
       this.messageInputField.setValueSilently(clearValue);
     }
 
-    if(isTouchSupported) {
+    if(IS_TOUCH_SUPPORTED) {
       //this.messageInput.innerText = '';
     } else {
       //this.attachMessageInputField();
@@ -1978,7 +1975,7 @@ export default class ChatInput {
       scroll.scrollTo(scroll.scrollHeight, 'top', true, true, 200);
     } */
 
-    if(!isMobile) {
+    if(!IS_MOBILE) {
       appNavigationController.pushItem({
         type: 'input-helper',
         onPop: () => {
diff --git a/src/components/chat/markupTooltip.ts b/src/components/chat/markupTooltip.ts
index efc2df82..1b2a4323 100644
--- a/src/components/chat/markupTooltip.ts
+++ b/src/components/chat/markupTooltip.ts
@@ -8,8 +8,8 @@ import type { AppImManager } from "../../lib/appManagers/appImManager";
 import RichTextProcessor from "../../lib/richtextprocessor";
 import ButtonIcon from "../buttonIcon";
 import { clamp } from "../../helpers/number";
-import { isTouchSupported } from "../../helpers/touchSupport";
-import { isApple, isMobile } from "../../helpers/userAgent";
+import { IS_TOUCH_SUPPORTED } from "../../environment/touchSupport";
+import { IS_APPLE, IS_MOBILE } from "../../environment/userAgent";
 import appNavigationController from "../appNavigationController";
 import { _i18n } from "../../lib/langPack";
 import { cancelEvent } from "../../helpers/dom/cancelEvent";
@@ -313,7 +313,7 @@ export default class MarkupTooltip {
     
     this.container.classList.add('is-visible');
 
-    if(!isMobile) {
+    if(!IS_MOBILE) {
       appNavigationController.pushItem({
         type: 'markup',
         onPop: () => {
@@ -337,7 +337,7 @@ export default class MarkupTooltip {
     //this.log('onMouseUpSingle');
     this.waitingForMouseUp = false;
 
-    if(isTouchSupported) {
+    if(IS_TOUCH_SUPPORTED) {
       cancelEvent(e);
       if(this.mouseUpCounter++ === 0) {
         this.resetSelection(this.savedRange);
@@ -362,7 +362,7 @@ export default class MarkupTooltip {
   }
 
   public cancelClosening() {
-    if(isTouchSupported && !isApple) {
+    if(IS_TOUCH_SUPPORTED && !IS_APPLE) {
       document.removeEventListener('mouseup', this.onMouseUpSingle);
       document.addEventListener('mouseup', (e) => {
         cancelEvent(e);
@@ -394,8 +394,8 @@ export default class MarkupTooltip {
         return;
       }
 
-      if(isTouchSupported) {
-        if(isApple) {
+      if(IS_TOUCH_SUPPORTED) {
+        if(IS_APPLE) {
           this.show();
           this.setTooltipPosition(); // * because can skip this in .show();
         } else {
diff --git a/src/components/chat/replyKeyboard.ts b/src/components/chat/replyKeyboard.ts
index b544d8b1..2609ebb3 100644
--- a/src/components/chat/replyKeyboard.ts
+++ b/src/components/chat/replyKeyboard.ts
@@ -13,7 +13,7 @@ import rootScope from "../../lib/rootScope";
 import { safeAssign } from "../../helpers/object";
 import ListenerSetter, { Listener } from "../../helpers/listenerSetter";
 import findUpClassName from "../../helpers/dom/findUpClassName";
-import { isTouchSupported } from "../../helpers/touchSupport";
+import { IS_TOUCH_SUPPORTED } from "../../environment/touchSupport";
 import findUpAsChild from "../../helpers/dom/findUpAsChild";
 import { cancelEvent } from "../../helpers/dom/cancelEvent";
 import { getHeavyAnimationPromise } from "../../hooks/useHeavyAnimationCheck";
@@ -64,7 +64,7 @@ export default class ReplyKeyboard extends DropdownHover {
     this.listenerSetter.add(this)('open', () => {
       this.render();
 
-      if(isTouchSupported) {
+      if(IS_TOUCH_SUPPORTED) {
         this.touchListener = this.listenerSetter.add(document.body)('touchstart', this.onBodyTouchStart, {passive: false, capture: true}) as any as Listener;
         this.listenerSetter.add(this)('close', () => {
           this.listenerSetter.remove(this.touchListener);
diff --git a/src/components/chat/selection.ts b/src/components/chat/selection.ts
index 6b2cbf7f..163826e3 100644
--- a/src/components/chat/selection.ts
+++ b/src/components/chat/selection.ts
@@ -8,7 +8,7 @@ import type { AppMessagesManager } from "../../lib/appManagers/appMessagesManage
 import type ChatBubbles from "./bubbles";
 import type ChatInput from "./input";
 import type Chat from "./chat";
-import { isTouchSupported } from "../../helpers/touchSupport";
+import { IS_TOUCH_SUPPORTED } from "../../environment/touchSupport";
 import Button from "../button";
 import ButtonIcon from "../buttonIcon";
 import CheckboxField from "../checkboxField";
@@ -19,7 +19,7 @@ import SetTransition from "../singleTransition";
 import ListenerSetter from "../../helpers/listenerSetter";
 import PopupSendNow from "../popups/sendNow";
 import appNavigationController, { NavigationItem } from "../appNavigationController";
-import { isMobileSafari } from "../../helpers/userAgent";
+import { IS_MOBILE_SAFARI } from "../../environment/userAgent";
 import I18n, { i18n, _i18n } from "../../lib/langPack";
 import findUpClassName from "../../helpers/dom/findUpClassName";
 import blurActiveElement from "../../helpers/dom/blurActiveElement";
@@ -85,7 +85,7 @@ class AppSelection {
 
     this.navigationType = 'multiselect-' + randomLong() as any;
 
-    if(isTouchSupported) {
+    if(IS_TOUCH_SUPPORTED) {
       this.listenerSetter.add(this.listenElement)('touchend', () => {
         if(!this.isSelecting) return;
         this.selectedText = getSelectedText();
@@ -367,7 +367,7 @@ class AppSelection {
       }
     } */
 
-    if(!isTouchSupported) {
+    if(!IS_TOUCH_SUPPORTED) {
       this.listenElement.classList.toggle('no-select', this.isSelecting);
 
       if(wasSelecting) {
@@ -390,7 +390,7 @@ class AppSelection {
     const forwards = !!size || forceSelection;
     this.onToggleSelection && this.onToggleSelection(forwards);
 
-    if(!isMobileSafari) {
+    if(!IS_MOBILE_SAFARI) {
       if(forwards) {
         appNavigationController.pushItem({
           type: this.navigationType,
diff --git a/src/components/chat/topbar.ts b/src/components/chat/topbar.ts
index 53869479..0019ba8f 100644
--- a/src/components/chat/topbar.ts
+++ b/src/components/chat/topbar.ts
@@ -14,7 +14,7 @@ import type { AppUsersManager } from "../../lib/appManagers/appUsersManager";
 import type Chat from "./chat";
 import { RIGHT_COLUMN_ACTIVE_CLASSNAME } from "../sidebarRight";
 import mediaSizes, { ScreenSize } from "../../helpers/mediaSizes";
-import { isSafari } from "../../helpers/userAgent";
+import { IS_SAFARI } from "../../environment/userAgent";
 import rootScope from "../../lib/rootScope";
 import AvatarElement from "../avatar";
 import Button from "../button";
@@ -685,7 +685,7 @@ export default class ChatTopbar {
     //return;
     if(this.setUtilsRAF) window.cancelAnimationFrame(this.setUtilsRAF);
 
-    if(isSafari && resize) {
+    if(IS_SAFARI && resize) {
       this.chatUtils.classList.add('hide');
     }
 
@@ -695,7 +695,7 @@ export default class ChatTopbar {
       //mutationRAF = window.requestAnimationFrame(() => {
         
         //setTimeout(() => {
-          if(isSafari && resize) {
+          if(IS_SAFARI && resize) {
             this.chatUtils.classList.remove('hide');
           }
           /* this.chatInfo.style.removeProperty('--utils-width');
diff --git a/src/components/emoticonsDropdown/index.ts b/src/components/emoticonsDropdown/index.ts
index fba65642..44f88184 100644
--- a/src/components/emoticonsDropdown/index.ts
+++ b/src/components/emoticonsDropdown/index.ts
@@ -4,7 +4,7 @@
  * https://github.com/morethanwords/tweb/blob/master/LICENSE
  */
 
-import { isTouchSupported } from "../../helpers/touchSupport";
+import { IS_TOUCH_SUPPORTED } from "../../environment/touchSupport";
 import appImManager from "../../lib/appManagers/appImManager";
 import rootScope from "../../lib/rootScope";
 import animationIntersector from "../animationIntersector";
@@ -61,7 +61,7 @@ export class EmoticonsDropdown extends DropdownHover {
     });
 
     this.addEventListener('open', async() => {
-      if(isTouchSupported) {
+      if(IS_TOUCH_SUPPORTED) {
         //appImManager.chat.input.saveScroll();
         if(blurActiveElement()) {
           await pause(100);
diff --git a/src/components/emoticonsDropdown/tabs/emoji.ts b/src/components/emoticonsDropdown/tabs/emoji.ts
index a38b62a9..1bc51b2e 100644
--- a/src/components/emoticonsDropdown/tabs/emoji.ts
+++ b/src/components/emoticonsDropdown/tabs/emoji.ts
@@ -9,7 +9,7 @@ import { cancelEvent } from "../../../helpers/dom/cancelEvent";
 import findUpClassName from "../../../helpers/dom/findUpClassName";
 import { fastRaf } from "../../../helpers/schedulers";
 import { pause } from "../../../helpers/schedulers/pause";
-import { isTouchSupported } from "../../../helpers/touchSupport";
+import { IS_TOUCH_SUPPORTED } from "../../../environment/touchSupport";
 import appEmojiManager from "../../../lib/appManagers/appEmojiManager";
 import appImManager from "../../../lib/appManagers/appImManager";
 import Config from "../../../lib/config";
@@ -20,6 +20,7 @@ import { emojiFromCodePoints } from "../../../vendor/emoji";
 import { putPreloader } from "../../misc";
 import Scrollable from "../../scrollable";
 import StickyIntersector from "../../stickyIntersector";
+import IS_EMOJI_SUPPORTED from "../../../environment/emojiSupport";
 
 const loadedURLs: Set<string> = new Set();
 export function appendEmoji(emoji: string, container: HTMLElement, prepend = false, unify = false) {
@@ -31,7 +32,7 @@ export function appendEmoji(emoji: string, container: HTMLElement, prepend = fal
   spanEmoji.classList.add('super-emoji');
 
   let kek: string;
-  if(unify && !RichTextProcessor.emojiSupported) {
+  if(unify && !IS_EMOJI_SUPPORTED) {
     kek = RichTextProcessor.wrapSingleEmoji(emoji);
   } else {
     emoji = RichTextProcessor.fixEmoji(emoji);
@@ -53,7 +54,7 @@ export function appendEmoji(emoji: string, container: HTMLElement, prepend = fal
     spanEmoji.append(first);
   }
 
-  if(spanEmoji.firstElementChild && !RichTextProcessor.emojiSupported) {
+  if(spanEmoji.firstElementChild && !IS_EMOJI_SUPPORTED) {
     const image = spanEmoji.firstElementChild as HTMLImageElement;
     
     const url = image.src;
@@ -295,7 +296,7 @@ export default class EmojiTab implements EmoticonsTab {
     const html = RichTextProcessor.wrapEmojiText(emoji, true);
     let inserted = false;
     if(window.getSelection) {
-      const savedRange = isTouchSupported ? undefined : emoticonsDropdown.getSavedRange();
+      const savedRange = IS_TOUCH_SUPPORTED ? undefined : emoticonsDropdown.getSavedRange();
       let sel = window.getSelection();
       if(savedRange) {
         sel.removeAllRanges();
diff --git a/src/components/misc.ts b/src/components/misc.ts
index ab13e06c..a44e1691 100644
--- a/src/components/misc.ts
+++ b/src/components/misc.ts
@@ -9,8 +9,8 @@ import { cancelEvent } from "../helpers/dom/cancelEvent";
 import { CLICK_EVENT_NAME } from "../helpers/dom/clickEvent";
 import ListenerSetter from "../helpers/listenerSetter";
 import mediaSizes from "../helpers/mediaSizes";
-import { isTouchSupported } from "../helpers/touchSupport";
-import { isApple, isMobileSafari } from "../helpers/userAgent";
+import { IS_TOUCH_SUPPORTED } from "../environment/touchSupport";
+import { IS_APPLE, IS_MOBILE_SAFARI } from "../environment/userAgent";
 import rootScope from "../lib/rootScope";
 import appNavigationController from "./appNavigationController";
 
@@ -101,7 +101,7 @@ export const closeBtnMenu = () => {
     openedMenuOnClose = null;
   }
 
-  if(!isTouchSupported) {
+  if(!IS_TOUCH_SUPPORTED) {
     window.removeEventListener('mousemove', onMouseMove);
     //window.removeEventListener('keydown', onKeyDown, {capture: true});
     window.removeEventListener('contextmenu', onClick);
@@ -109,7 +109,7 @@ export const closeBtnMenu = () => {
 
   document.removeEventListener(CLICK_EVENT_NAME, onClick);
 
-  if(!isMobileSafari) {
+  if(!IS_MOBILE_SAFARI) {
     appNavigationController.removeByType('menu');
   }
 };
@@ -131,7 +131,7 @@ let openedMenu: HTMLElement = null, openedMenuOnClose: () => void = null, menuOv
 export function openBtnMenu(menuElement: HTMLElement, onClose?: () => void) {
   closeBtnMenu();
 
-  if(!isMobileSafari) {
+  if(!IS_MOBILE_SAFARI) {
     appNavigationController.pushItem({
       type: 'menu',
       onPop: (canAnimate) => {
@@ -161,7 +161,7 @@ export function openBtnMenu(menuElement: HTMLElement, onClose?: () => void) {
   
   openedMenuOnClose = onClose;
 
-  if(!isTouchSupported) {
+  if(!IS_TOUCH_SUPPORTED) {
     window.addEventListener('mousemove', onMouseMove);
     //window.addEventListener('keydown', onKeyDown, {capture: true});
     window.addEventListener('contextmenu', onClick, {once: true});
@@ -297,7 +297,7 @@ export function attachContextMenuListener(element: HTMLElement, callback: (e: To
   const add = listenerSetter ? listenerSetter.add(element) : element.addEventListener.bind(element);
   const remove = listenerSetter ? listenerSetter.removeManual.bind(listenerSetter, element) : element.removeEventListener.bind(element);
 
-  if(isApple && isTouchSupported) {
+  if(IS_APPLE && IS_TOUCH_SUPPORTED) {
     let timeout: number;
 
     const options: EventListenerOptions = {capture: true};
@@ -343,7 +343,7 @@ export function attachContextMenuListener(element: HTMLElement, callback: (e: To
       }, {passive: false, capture: true});
     } */
   } else {
-    add('contextmenu', isTouchSupported ? (e: any) => {
+    add('contextmenu', IS_TOUCH_SUPPORTED ? (e: any) => {
       callback(e);
 
       if(openedMenu) {
diff --git a/src/components/poll.ts b/src/components/poll.ts
index 5ba5a5d5..0fabc713 100644
--- a/src/components/poll.ts
+++ b/src/components/poll.ts
@@ -5,7 +5,7 @@
  */
 
 import mediaSizes from "../helpers/mediaSizes";
-import { isTouchSupported } from "../helpers/touchSupport";
+import { IS_TOUCH_SUPPORTED } from "../environment/touchSupport";
 import appImManager from "../lib/appManagers/appImManager";
 import appPollsManager, { Poll, PollResults } from "../lib/appManagers/appPollsManager";
 import serverTimeManager from "../lib/mtproto/serverTimeManager";
@@ -161,7 +161,7 @@ const setQuizHint = (solution: string, solution_entities: any[], onHide: () => v
   prevQuizHintOnHide = onHide;
   prevQuizHintTimeout = window.setTimeout(() => {
     hideQuizHint(element, onHide, prevQuizHintTimeout);
-  }, isTouchSupported ? 5000 : 7000);
+  }, IS_TOUCH_SUPPORTED ? 5000 : 7000);
 };
 
 export default class PollElement extends HTMLElement {
diff --git a/src/components/popups/newMedia.ts b/src/components/popups/newMedia.ts
index 2c6eaa07..88e108b9 100644
--- a/src/components/popups/newMedia.ts
+++ b/src/components/popups/newMedia.ts
@@ -22,6 +22,7 @@ import rootScope from "../../lib/rootScope";
 import RichTextProcessor from "../../lib/richtextprocessor";
 import { MediaSize } from "../../helpers/mediaSizes";
 import { attachClickEvent } from "../../helpers/dom/clickEvent";
+import MEDIA_MIME_TYPES_SUPPORTED from '../../environment/mediaMimeTypesSupport';
 
 type SendFileParams = Partial<{
   file: File,
@@ -368,13 +369,11 @@ export default class PopupNewMedia extends PopupElement {
       willAttach.type = 'document';
     } */
 
-    files = files.filter(file => {
-      if(willAttach.type === 'media') {
-        return ['image/', 'video/'].find(s => file.type.indexOf(s) === 0);
-      } else {
-        return true;
-      }
-    });
+    if(willAttach.type === 'media') {
+      files = files.filter(file => MEDIA_MIME_TYPES_SUPPORTED.has(file.type));
+    } else {
+      files = files.slice();
+    }
 
     Promise.all(files.map(this.attachFile)).then(results => {
       this.container.classList.remove('is-media', 'is-document', 'is-album');
diff --git a/src/components/popups/pickUser.ts b/src/components/popups/pickUser.ts
index 5e3d0e90..47021eab 100644
--- a/src/components/popups/pickUser.ts
+++ b/src/components/popups/pickUser.ts
@@ -4,7 +4,7 @@
  * https://github.com/morethanwords/tweb/blob/master/LICENSE
  */
 
-import { isTouchSupported } from "../../helpers/touchSupport";
+import { IS_TOUCH_SUPPORTED } from "../../environment/touchSupport";
 import AppSelectPeers from "../appSelectPeers";
 import PopupElement from ".";
 import { LangPackKey, _i18n } from "../../lib/langPack";
@@ -50,7 +50,7 @@ export default class PopupPickUser extends PopupElement {
         this.show();
         this.selector.checkForTriggers(); // ! due to zero height before mounting
 
-        if(!isTouchSupported) {
+        if(!IS_TOUCH_SUPPORTED) {
           this.selector.input.focus();
         }
       }, 
diff --git a/src/components/ripple.ts b/src/components/ripple.ts
index 1eb51d1e..a6f34165 100644
--- a/src/components/ripple.ts
+++ b/src/components/ripple.ts
@@ -6,7 +6,7 @@
 
 import findUpClassName from "../helpers/dom/findUpClassName";
 import sequentialDom from "../helpers/sequentialDom";
-import {isTouchSupported} from "../helpers/touchSupport";
+import {IS_TOUCH_SUPPORTED} from "../environment/touchSupport";
 import rootScope from "../lib/rootScope";
 
 let rippleClickId = 0;
@@ -63,7 +63,7 @@ export function ripple(elem: HTMLElement, callback: (id: number) => Promise<bool
         setTimeout(cb, duration / 2);
       }
 
-      if(!isTouchSupported) {
+      if(!IS_TOUCH_SUPPORTED) {
         window.removeEventListener('contextmenu', handler);
       }
 
@@ -136,7 +136,7 @@ export function ripple(elem: HTMLElement, callback: (id: number) => Promise<bool
 
   // TODO: rename this variable
   let touchStartFired = false;
-  if(isTouchSupported) {
+  if(IS_TOUCH_SUPPORTED) {
     let touchEnd = () => {
       handler && handler();
     };
diff --git a/src/components/scrollable.ts b/src/components/scrollable.ts
index b8a5341a..1c95a3b0 100644
--- a/src/components/scrollable.ts
+++ b/src/components/scrollable.ts
@@ -4,7 +4,7 @@
  * https://github.com/morethanwords/tweb/blob/master/LICENSE
  */
 
-import { isTouchSupported } from "../helpers/touchSupport";
+import { IS_TOUCH_SUPPORTED } from "../environment/touchSupport";
 import { logger, LogTypes } from "../lib/logger";
 import fastSmoothScroll, { FocusDirection } from "../helpers/fastSmoothScroll";
 import useHeavyAnimationCheck from "../hooks/useHeavyAnimationCheck";
@@ -248,7 +248,7 @@ export class ScrollableX extends ScrollableBase {
 
     this.container.classList.add('scrollable-x');
 
-    if(!isTouchSupported) {
+    if(!IS_TOUCH_SUPPORTED) {
       const scrollHorizontally = (e: any) => {
         if(!e.deltaX && this.container.scrollWidth > this.container.clientWidth) {
           this.container.scrollLeft += e.deltaY / 4;
diff --git a/src/components/sidebarLeft/index.ts b/src/components/sidebarLeft/index.ts
index 9b37fd76..247a3aa2 100644
--- a/src/components/sidebarLeft/index.ts
+++ b/src/components/sidebarLeft/index.ts
@@ -28,7 +28,7 @@ import AppAddMembersTab from "./tabs/addMembers";
 import { i18n_, LangPackKey } from "../../lib/langPack";
 import { ButtonMenuItemOptions } from "../buttonMenu";
 import CheckboxField from "../checkboxField";
-import { isMobileSafari } from "../../helpers/userAgent";
+import { IS_MOBILE_SAFARI } from "../../environment/userAgent";
 import appNavigationController from "../appNavigationController";
 import findUpClassName from "../../helpers/dom/findUpClassName";
 import findUpTag from "../../helpers/dom/findUpTag";
@@ -531,7 +531,7 @@ export class AppSidebarLeft extends SidebarSlider {
       this.newBtnMenu.classList.add('is-hidden');
       this.toolsBtn.parentElement.firstElementChild.classList.toggle('state-back', true);
 
-      if(!isMobileSafari && !appNavigationController.findItemByType('global-search')) {
+      if(!IS_MOBILE_SAFARI && !appNavigationController.findItemByType('global-search')) {
         appNavigationController.pushItem({
           onPop: () => {
             close();
diff --git a/src/components/sidebarLeft/tabs/contacts.ts b/src/components/sidebarLeft/tabs/contacts.ts
index 169932aa..2edba4c2 100644
--- a/src/components/sidebarLeft/tabs/contacts.ts
+++ b/src/components/sidebarLeft/tabs/contacts.ts
@@ -8,7 +8,7 @@ import { SliderSuperTab } from "../../slider";
 import appDialogsManager from "../../../lib/appManagers/appDialogsManager";
 import appUsersManager from "../../../lib/appManagers/appUsersManager";
 import InputSearch from "../../inputSearch";
-import { isMobile } from "../../../helpers/userAgent";
+import { IS_MOBILE } from "../../../environment/userAgent";
 import { canFocus } from "../../../helpers/dom/canFocus";
 import windowSize from "../../../helpers/windowSize";
 import ButtonCorner from "../../buttonCorner";
@@ -75,7 +75,7 @@ export default class AppContactsTab extends SliderSuperTab {
   }
 
   protected onOpenAfterTimeout() {
-    if(isMobile || !canFocus(true)) return;
+    if(IS_MOBILE || !canFocus(true)) return;
     this.inputSearch.input.focus();
   }
 
diff --git a/src/components/sidebarLeft/tabs/generalSettings.ts b/src/components/sidebarLeft/tabs/generalSettings.ts
index 85d410a5..5a9389d7 100644
--- a/src/components/sidebarLeft/tabs/generalSettings.ts
+++ b/src/components/sidebarLeft/tabs/generalSettings.ts
@@ -12,7 +12,7 @@ import CheckboxField from "../../checkboxField";
 import RadioField from "../../radioField";
 import appStateManager from "../../../lib/appManagers/appStateManager";
 import rootScope from "../../../lib/rootScope";
-import { isApple } from "../../../helpers/userAgent";
+import { IS_APPLE } from "../../../environment/userAgent";
 import Row from "../../row";
 import AppBackgroundTab from "./background";
 import { LangPackKey, _i18n } from "../../../lib/langPack";
@@ -120,7 +120,7 @@ export default class AppGeneralSettingsTab extends SliderSuperTab {
         }),
         subtitleLangKey: 'General.SendShortcut.NewLine.Enter'
       });
-      _i18n(ctrlEnterRow.radioField.main, 'General.SendShortcut.CtrlEnter', [isApple ? '⌘' : 'Ctrl']);
+      _i18n(ctrlEnterRow.radioField.main, 'General.SendShortcut.CtrlEnter', [IS_APPLE ? '⌘' : 'Ctrl']);
       
       form.append(enterRow.container, ctrlEnterRow.container);
       container.append(form);
diff --git a/src/components/sidebarRight/tabs/sharedMedia.ts b/src/components/sidebarRight/tabs/sharedMedia.ts
index 516aca7d..2d7957b9 100644
--- a/src/components/sidebarRight/tabs/sharedMedia.ts
+++ b/src/components/sidebarRight/tabs/sharedMedia.ts
@@ -39,8 +39,8 @@ import AppAddMembersTab from "../../sidebarLeft/tabs/addMembers";
 import PopupPickUser from "../../popups/pickUser";
 import PopupPeer, { PopupPeerButtonCallbackCheckboxes, PopupPeerCheckboxOptions } from "../../popups/peer";
 import Scrollable from "../../scrollable";
-import { isTouchSupported } from "../../../helpers/touchSupport";
-import { isFirefox } from "../../../helpers/userAgent";
+import { IS_TOUCH_SUPPORTED } from "../../../environment/touchSupport";
+import { IS_FIREFOX } from "../../../environment/userAgent";
 import appDownloadManager from "../../../lib/appManagers/appDownloadManager";
 import ButtonCorner from "../../buttonCorner";
 import { cancelEvent } from "../../../helpers/dom/cancelEvent";
@@ -58,7 +58,7 @@ let setText = (text: string, row: Row) => {
   //});
 };
 
-const PARALLAX_SUPPORTED = !isFirefox && false;
+const PARALLAX_SUPPORTED = !IS_FIREFOX && false;
 
 export function filterChatPhotosMessages(value: {
   count: number;
@@ -199,7 +199,7 @@ class PeerProfileAvatars {
 
     const cancelNextClick = () => {
       cancel = true;
-      document.body.addEventListener(isTouchSupported ? 'touchend' : 'click', (e) => {
+      document.body.addEventListener(IS_TOUCH_SUPPORTED ? 'touchend' : 'click', (e) => {
         cancel = false;
       }, {once: true});
     };
diff --git a/src/components/swipeHandler.ts b/src/components/swipeHandler.ts
index b38823f6..e6144073 100644
--- a/src/components/swipeHandler.ts
+++ b/src/components/swipeHandler.ts
@@ -6,7 +6,7 @@
 
 import { cancelEvent } from "../helpers/dom/cancelEvent";
 import { safeAssign } from "../helpers/object";
-import { isTouchSupported } from "../helpers/touchSupport";
+import { IS_TOUCH_SUPPORTED } from "../environment/touchSupport";
 import rootScope from "../lib/rootScope";
 
 const getEvent = (e: TouchEvent | MouseEvent) => {
@@ -48,7 +48,7 @@ export default class SwipeHandler {
   }
 
   public setListeners() {
-    if(!isTouchSupported) {
+    if(!IS_TOUCH_SUPPORTED) {
       this.element.addEventListener('mousedown', this.handleStart, false);
       attachGlobalListenerTo.addEventListener('mouseup', this.reset);
     } else {
@@ -58,7 +58,7 @@ export default class SwipeHandler {
   }
 
   public removeListeners() {
-    if(!isTouchSupported) {
+    if(!IS_TOUCH_SUPPORTED) {
       this.element.removeEventListener('mousedown', this.handleStart, false);
       attachGlobalListenerTo.removeEventListener('mouseup', this.reset);
     } else {
@@ -72,7 +72,7 @@ export default class SwipeHandler {
       cancelEvent(e);
     } */
 
-    if(isTouchSupported) {
+    if(IS_TOUCH_SUPPORTED) {
       attachGlobalListenerTo.removeEventListener('touchmove', this.handleMove, {capture: true});
     } else {
       attachGlobalListenerTo.removeEventListener('mousemove', this.handleMove);
@@ -96,7 +96,7 @@ export default class SwipeHandler {
     this.xDown = e.clientX;
     this.yDown = e.clientY;
 
-    if(isTouchSupported) {
+    if(IS_TOUCH_SUPPORTED) {
       attachGlobalListenerTo.addEventListener('touchmove', this.handleMove, {passive: false, capture: true});
     } else {
       attachGlobalListenerTo.addEventListener('mousemove', this.handleMove, false);
@@ -127,7 +127,7 @@ export default class SwipeHandler {
 
       this.hadMove = true;
 
-      if(!isTouchSupported) {
+      if(!IS_TOUCH_SUPPORTED) {
         this.element.style.setProperty('cursor', this.cursor, 'important');
       }
 
diff --git a/src/components/telInputField.ts b/src/components/telInputField.ts
index 87787467..b3d61318 100644
--- a/src/components/telInputField.ts
+++ b/src/components/telInputField.ts
@@ -6,7 +6,7 @@
 
 import placeCaretAtEnd from "../helpers/dom/placeCaretAtEnd";
 import { formatPhoneNumber } from "../helpers/formatPhoneNumber";
-import { isApple, isAndroid, isAppleMobile } from "../helpers/userAgent";
+import { IS_APPLE, IS_ANDROID, IS_APPLE_MOBILE } from "../environment/userAgent";
 import { HelpCountry, HelpCountryCode } from "../layer";
 import InputField, { InputFieldOptions } from "./inputField";
 
@@ -36,9 +36,9 @@ export default class TelInputField extends InputField {
       const pixelRatio = window.devicePixelRatio;
       if(pixelRatio > 1) {
         let letterSpacing: number;
-        if(isApple) {
+        if(IS_APPLE) {
           letterSpacing = pixelRatio * -.16;
-        } else if(isAndroid) {
+        } else if(IS_ANDROID) {
           letterSpacing = 0;
         }
 
@@ -58,7 +58,7 @@ export default class TelInputField extends InputField {
   
       const value = this.value;
       const diff = Math.abs(value.length - this.lastValue.length);
-      if(diff > 1 && !this.pasted && isAppleMobile) {
+      if(diff > 1 && !this.pasted && IS_APPLE_MOBILE) {
         this.setValueSilently(this.lastValue + value);
       }
   
diff --git a/src/components/wrappers.ts b/src/components/wrappers.ts
index c0ba847c..6127fa34 100644
--- a/src/components/wrappers.ts
+++ b/src/components/wrappers.ts
@@ -11,7 +11,7 @@ import { deferredPromise } from '../helpers/cancellablePromise';
 import { formatDateAccordingToToday, months } from '../helpers/date';
 import mediaSizes, { ScreenSize } from '../helpers/mediaSizes';
 import { formatBytes } from '../helpers/number';
-import { isSafari } from '../helpers/userAgent';
+import { IS_SAFARI } from '../environment/userAgent';
 import { PhotoSize, StickerSet } from '../layer';
 import appDocsManager, { MyDocument } from "../lib/appManagers/appDocsManager";
 import appMessagesManager from '../lib/appManagers/appMessagesManager';
@@ -44,6 +44,8 @@ import isInDOM from '../helpers/dom/isInDOM';
 import lottieLoader from '../lib/lottieLoader';
 import { clearBadCharsAndTrim } from '../helpers/cleanSearchText';
 import blur from '../helpers/blur';
+import IS_WEBP_SUPPORTED from '../environment/webpSupport';
+import MEDIA_MIME_TYPES_SUPPORTED from '../environment/mediaMimeTypesSupport';
 
 const MAX_VIDEO_AUTOPLAY_SIZE = 50 * 1024 * 1024; // 50 MB
 
@@ -382,7 +384,7 @@ export function wrapVideo({doc, container, message, boxWidth, boxHeight, withTai
           loadPromise = Promise.reject();
         } else if(!cacheContext.downloaded) { // * check for uploading video
           preloader.attach(container, false, null);
-          video.addEventListener(isSafari ? 'timeupdate' : 'canplay', () => {
+          video.addEventListener(IS_SAFARI ? 'timeupdate' : 'canplay', () => {
             preloader.detach();
           }, {once: true});
         }
@@ -640,10 +642,12 @@ export function wrapDocument({message, withTime, fontWeight, voiceAsMusic, showS
     } else if(doc.type === 'pdf') {
       download = appDocsManager.downloadDoc(doc, queueId);
       download.then(() => {
-        const cacheContext = appDownloadManager.getCacheContext(doc);
-        window.open(cacheContext.url);
+        setTimeout(() => { // wait for preloader animation end
+          const url = appDownloadManager.getCacheContext(doc).url;
+          window.open(url);
+        }, rootScope.settings.animationsEnabled ? 250 : 0);
       });
-    } else if(doc.type === 'photo' || doc.type === 'video' || doc.mime_type.indexOf('video/') === 0) {
+    } else if(MEDIA_MIME_TYPES_SUPPORTED.has(doc.mime_type)) {
       download = appDocsManager.downloadDoc(doc, queueId);
     } else {
       download = appDocsManager.saveDocFile(doc, queueId);
@@ -1149,7 +1153,7 @@ export function wrapSticker({doc, div, middleware, lazyLoadQueue, group, play, o
       if(thumb && thumb._ !== 'photoPathSize' && toneIndex <= 0) {
         thumbImage = new Image();
 
-        if((webpWorkerController.isWebpSupported() || doc.pFlags.stickerThumbConverted || cacheContext.url)/*  && false */) {
+        if((IS_WEBP_SUPPORTED || doc.pFlags.stickerThumbConverted || cacheContext.url)/*  && false */) {
           renderImageFromUrl(thumbImage, appPhotosManager.getPreviewURLFromThumb(doc, thumb as PhotoSize.photoStrippedSize, true), afterRender);
           haveThumbCached = true;
         } else {
diff --git a/src/environment/ctx.ts b/src/environment/ctx.ts
new file mode 100644
index 00000000..a3496e50
--- /dev/null
+++ b/src/environment/ctx.ts
@@ -0,0 +1,3 @@
+const ctx = typeof(window) !== 'undefined' ? window : self;
+
+export default ctx;
\ No newline at end of file
diff --git a/src/helpers/emojiSupport.ts b/src/environment/emojiSupport.ts
similarity index 100%
rename from src/helpers/emojiSupport.ts
rename to src/environment/emojiSupport.ts
diff --git a/src/environment/mediaMimeTypesSupport.ts b/src/environment/mediaMimeTypesSupport.ts
new file mode 100644
index 00000000..3125e725
--- /dev/null
+++ b/src/environment/mediaMimeTypesSupport.ts
@@ -0,0 +1,21 @@
+import IS_MOV_SUPPORTED from "./movSupport";
+import IS_WEBP_SUPPORTED from "./webpSupport";
+
+const MEDIA_MIME_TYPES_SUPPORTED = new Set([
+  'image/jpeg',
+  'image/png',
+  'image/gif',
+  'image/bmp',
+  'video/mp4',
+  'video/webm'
+]);
+
+if(IS_MOV_SUPPORTED) {
+  MEDIA_MIME_TYPES_SUPPORTED.add('video/quicktime');
+}
+
+if(IS_WEBP_SUPPORTED) {
+  MEDIA_MIME_TYPES_SUPPORTED.add('image/webp');
+}
+
+export default MEDIA_MIME_TYPES_SUPPORTED;
diff --git a/src/environment/movSupport.ts b/src/environment/movSupport.ts
new file mode 100644
index 00000000..68f336da
--- /dev/null
+++ b/src/environment/movSupport.ts
@@ -0,0 +1,6 @@
+import { IS_APPLE_MOBILE, IS_SAFARI } from "./userAgent";
+
+// mov is not supported in Chrome on macOS
+const IS_MOV_SUPPORTED = !!document.createElement('video').canPlayType('video/quicktime') || IS_SAFARI || IS_APPLE_MOBILE;
+
+export default IS_MOV_SUPPORTED;
diff --git a/src/helpers/touchSupport.ts b/src/environment/touchSupport.ts
similarity index 53%
rename from src/helpers/touchSupport.ts
rename to src/environment/touchSupport.ts
index d4ff1a7f..d74a06c1 100644
--- a/src/helpers/touchSupport.ts
+++ b/src/environment/touchSupport.ts
@@ -5,4 +5,4 @@
  */
 
 // @ts-ignore
-export const isTouchSupported = ('ontouchstart' in window) || (window.DocumentTouch && document instanceof DocumentTouch)/*  || true */;
\ No newline at end of file
+export const IS_TOUCH_SUPPORTED = ('ontouchstart' in window) || (window.DocumentTouch && document instanceof DocumentTouch)/*  || true */;
\ No newline at end of file
diff --git a/src/environment/userAgent.ts b/src/environment/userAgent.ts
new file mode 100644
index 00000000..ddc2cc38
--- /dev/null
+++ b/src/environment/userAgent.ts
@@ -0,0 +1,24 @@
+/*
+ * https://github.com/morethanwords/tweb
+ * Copyright (C) 2019-2021 Eduard Kuzmenko
+ * https://github.com/morethanwords/tweb/blob/master/LICENSE
+ */
+
+import ctx from './ctx';
+
+export const USER_AGENT = navigator ? navigator.userAgent : null;
+export const IS_APPLE = navigator.userAgent.search(/OS X|iPhone|iPad|iOS/i) !== -1;
+export const IS_ANDROID = navigator.userAgent.toLowerCase().indexOf('android') !== -1;
+export const IS_CHROMIUM = /Chrome/.test(navigator.userAgent) && /Google Inc/.test(navigator.vendor);
+
+// https://stackoverflow.com/a/58065241
+export const IS_APPLE_MOBILE = (/iPad|iPhone|iPod/.test(navigator.platform) ||
+  (navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1)) &&
+  !(ctx as any).MSStream;
+
+export const IS_SAFARI = !!('safari' in ctx) || !!(USER_AGENT && (/\b(iPad|iPhone|iPod)\b/.test(USER_AGENT) || (!!USER_AGENT.match('Safari') && !USER_AGENT.match('Chrome'))))/*  || true */;
+export const IS_FIREFOX = navigator.userAgent.toLowerCase().indexOf('firefox') > -1;
+
+export const IS_MOBILE_SAFARI = IS_SAFARI && IS_APPLE_MOBILE;
+
+export const IS_MOBILE = /* screen.width && screen.width < 480 ||  */navigator.maxTouchPoints > 0 && navigator.userAgent.search(/iOS|iPhone OS|Android|BlackBerry|BB10|Series ?[64]0|J2ME|MIDP|opera mini|opera mobi|mobi.+Gecko|Windows Phone/i) != -1;
diff --git a/src/environment/webpSupport.ts b/src/environment/webpSupport.ts
new file mode 100644
index 00000000..497e4ba0
--- /dev/null
+++ b/src/environment/webpSupport.ts
@@ -0,0 +1,3 @@
+const IS_WEBP_SUPPORTED = document.createElement('canvas').toDataURL('image/webp').startsWith('data:image/webp');
+
+export default IS_WEBP_SUPPORTED;
\ No newline at end of file
diff --git a/src/helpers/dom/canFocus.ts b/src/helpers/dom/canFocus.ts
index 4fcd77b0..c795ccf1 100644
--- a/src/helpers/dom/canFocus.ts
+++ b/src/helpers/dom/canFocus.ts
@@ -4,8 +4,8 @@
  * https://github.com/morethanwords/tweb/blob/master/LICENSE
  */
 
-import { isMobileSafari } from "../userAgent";
+import { IS_MOBILE_SAFARI } from "../../environment/userAgent";
 
 export function canFocus(isFirstInput: boolean) {
-  return !isMobileSafari || !isFirstInput;
+  return !IS_MOBILE_SAFARI || !isFirstInput;
 }
diff --git a/src/helpers/dom/clickEvent.ts b/src/helpers/dom/clickEvent.ts
index 03bbe063..d60dbab0 100644
--- a/src/helpers/dom/clickEvent.ts
+++ b/src/helpers/dom/clickEvent.ts
@@ -5,10 +5,10 @@
  */
 
 import type ListenerSetter from "../listenerSetter";
-import { isTouchSupported } from "../touchSupport";
+import { IS_TOUCH_SUPPORTED } from "../../environment/touchSupport";
 import simulateEvent from "./dispatchEvent";
 
-export const CLICK_EVENT_NAME: 'mousedown' /* | 'touchend' */ | 'click' = (isTouchSupported ? 'mousedown' : 'click') as any;
+export const CLICK_EVENT_NAME: 'mousedown' /* | 'touchend' */ | 'click' = (IS_TOUCH_SUPPORTED ? 'mousedown' : 'click') as any;
 export type AttachClickOptions = AddEventListenerOptions & Partial<{listenerSetter: ListenerSetter, touchMouseDown: true}>;
 export function attachClickEvent(elem: HTMLElement | Window, callback: (e: /* TouchEvent |  */MouseEvent) => void, options: AttachClickOptions = {}) {
   const add = options.listenerSetter ? options.listenerSetter.add(elem) : elem.addEventListener.bind(elem);
diff --git a/src/helpers/dom/fixSafariStickyInputFocusing.ts b/src/helpers/dom/fixSafariStickyInputFocusing.ts
index 12a2cafd..a21c8b88 100644
--- a/src/helpers/dom/fixSafariStickyInputFocusing.ts
+++ b/src/helpers/dom/fixSafariStickyInputFocusing.ts
@@ -4,12 +4,12 @@
  * https://github.com/morethanwords/tweb/blob/master/LICENSE
  */
 
-import { isTouchSupported } from "../touchSupport";
-import { isMobile, isSafari } from "../userAgent";
+import { IS_TOUCH_SUPPORTED } from "../../environment/touchSupport";
+import { IS_MOBILE, IS_SAFARI } from "../../environment/userAgent";
 import findUpClassName from "./findUpClassName";
 import fixSafariStickyInput from "./fixSafariStickyInput";
 
-export const IS_STICKY_INPUT_BUGGED = isSafari && isMobile && isTouchSupported;
+export const IS_STICKY_INPUT_BUGGED = IS_SAFARI && IS_MOBILE && IS_TOUCH_SUPPORTED;
 
 if(IS_STICKY_INPUT_BUGGED) {
   let key: 'clientY' | 'pageY' = 'clientY';
diff --git a/src/helpers/dom/handleScrollSideEvent.ts b/src/helpers/dom/handleScrollSideEvent.ts
index f77dc5d0..8f16d42f 100644
--- a/src/helpers/dom/handleScrollSideEvent.ts
+++ b/src/helpers/dom/handleScrollSideEvent.ts
@@ -5,10 +5,10 @@
  */
 
 import type ListenerSetter from "../listenerSetter";
-import { isTouchSupported } from "../touchSupport";
+import { IS_TOUCH_SUPPORTED } from "../../environment/touchSupport";
 
 export default function handleScrollSideEvent(elem: HTMLElement, side: 'top' | 'bottom', callback: () => void, listenerSetter: ListenerSetter) {
-  if(isTouchSupported) {
+  if(IS_TOUCH_SUPPORTED) {
     let lastY: number;
     const options = {passive: true};
     listenerSetter.add(elem)('touchstart', (e) => {
diff --git a/src/helpers/dom/isSendShortcutPressed.ts b/src/helpers/dom/isSendShortcutPressed.ts
index 9cb103c9..c66a418d 100644
--- a/src/helpers/dom/isSendShortcutPressed.ts
+++ b/src/helpers/dom/isSendShortcutPressed.ts
@@ -5,10 +5,10 @@
  */
 
 import rootScope from "../../lib/rootScope";
-import { isMobile, isApple } from "../userAgent";
+import { IS_MOBILE, IS_APPLE } from "../../environment/userAgent";
 
 export default function isSendShortcutPressed(e: KeyboardEvent) {
-  if(e.key === 'Enter' && !isMobile && !e.isComposing) {
+  if(e.key === 'Enter' && !IS_MOBILE && !e.isComposing) {
     /* if(e.ctrlKey || e.metaKey) {
       this.messageInput.innerHTML += '<br>';
       placeCaretAtEnd(this.message)
@@ -22,8 +22,8 @@ export default function isSendShortcutPressed(e: KeyboardEvent) {
 
       return true;
     } else {
-      const secondaryKey = isApple ? e.metaKey : e.ctrlKey;
-      if(e.shiftKey || (isApple ? e.ctrlKey : e.metaKey)) {
+      const secondaryKey = IS_APPLE ? e.metaKey : e.ctrlKey;
+      if(e.shiftKey || (IS_APPLE ? e.ctrlKey : e.metaKey)) {
         return;
       }
 
diff --git a/src/helpers/dom/placeCaretAtEnd.ts b/src/helpers/dom/placeCaretAtEnd.ts
index d8542453..78f58825 100644
--- a/src/helpers/dom/placeCaretAtEnd.ts
+++ b/src/helpers/dom/placeCaretAtEnd.ts
@@ -9,10 +9,10 @@
  * https://github.com/zhukov/webogram/blob/master/LICENSE
  */
 
-import { isTouchSupported } from "../touchSupport";
+import { IS_TOUCH_SUPPORTED } from "../../environment/touchSupport";
 
 export default function placeCaretAtEnd(el: HTMLElement, ignoreTouchCheck = false) {
-  if(isTouchSupported && (!ignoreTouchCheck || document.activeElement !== el)) {
+  if(IS_TOUCH_SUPPORTED && (!ignoreTouchCheck || document.activeElement !== el)) {
     return;
   }
   
diff --git a/src/helpers/dropdownHover.ts b/src/helpers/dropdownHover.ts
index 72423be2..c80672a7 100644
--- a/src/helpers/dropdownHover.ts
+++ b/src/helpers/dropdownHover.ts
@@ -9,7 +9,7 @@ import findUpAsChild from "./dom/findUpAsChild";
 import EventListenerBase from "./eventListenerBase";
 import ListenerSetter from "./listenerSetter";
 import { safeAssign } from "./object";
-import { isTouchSupported } from "./touchSupport";
+import { IS_TOUCH_SUPPORTED } from "../environment/touchSupport";
 
 const KEEP_OPEN = false;
 const TOGGLE_TIMEOUT = 200;
@@ -35,7 +35,7 @@ export default class DropdownHover extends EventListenerBase<{
 
   public attachButtonListener(button: HTMLElement, listenerSetter: ListenerSetter) {
     let firstTime = true;
-    if(isTouchSupported) {
+    if(IS_TOUCH_SUPPORTED) {
       attachClickEvent(button, () => {
         if(firstTime) {
           firstTime = false;
@@ -76,7 +76,7 @@ export default class DropdownHover extends EventListenerBase<{
   };
 
   protected init() {
-    if(!isTouchSupported) {
+    if(!IS_TOUCH_SUPPORTED) {
       this.element.onmouseout = this.onMouseOut;
       this.element.onmouseover = (e) => {
         if(this.forceClose) {
@@ -117,7 +117,7 @@ export default class DropdownHover extends EventListenerBase<{
       this.displayTimeout = window.setTimeout(() => {
         this.forceClose = false;
         this.dispatchEvent('opened');
-      }, isTouchSupported ? 0 : ANIMATION_DURATION);
+      }, IS_TOUCH_SUPPORTED ? 0 : ANIMATION_DURATION);
 
       // ! can't use together with resizeObserver
       /* if(isTouchSupported) {
@@ -139,7 +139,7 @@ export default class DropdownHover extends EventListenerBase<{
         this.element.style.display = 'none';
         this.forceClose = false;
         this.dispatchEvent('closed');
-      }, isTouchSupported ? 0 : ANIMATION_DURATION);
+      }, IS_TOUCH_SUPPORTED ? 0 : ANIMATION_DURATION);
 
       /* if(isTouchSupported) {
         const scrollHeight = this.container.scrollHeight;
diff --git a/src/helpers/files.ts b/src/helpers/files.ts
index 2f40926b..387c4fe6 100644
--- a/src/helpers/files.ts
+++ b/src/helpers/files.ts
@@ -6,7 +6,7 @@
 
 import { makeMediaSize, MediaSize } from "./mediaSizes";
 import { pause } from "./schedulers/pause";
-import { isAppleMobile } from "./userAgent";
+import { IS_APPLE_MOBILE } from "../environment/userAgent";
 
 export function scaleMediaElement(options: {
   media: CanvasImageSource, 
@@ -76,7 +76,7 @@ export function onVideoLoad(video: HTMLVideoElement) {
       return;
     }
 
-    video.addEventListener(isAppleMobile ? 'loadeddata' : 'canplay', () => resolve(), {once: true});
+    video.addEventListener(IS_APPLE_MOBILE ? 'loadeddata' : 'canplay', () => resolve(), {once: true});
   });
 }
 
diff --git a/src/helpers/userAgent.ts b/src/helpers/userAgent.ts
deleted file mode 100644
index 9a239545..00000000
--- a/src/helpers/userAgent.ts
+++ /dev/null
@@ -1,24 +0,0 @@
-/*
- * https://github.com/morethanwords/tweb
- * Copyright (C) 2019-2021 Eduard Kuzmenko
- * https://github.com/morethanwords/tweb/blob/master/LICENSE
- */
-
-export const userAgent = navigator ? navigator.userAgent : null;
-export const isApple = navigator.userAgent.search(/OS X|iPhone|iPad|iOS/i) !== -1;
-export const isAndroid = navigator.userAgent.toLowerCase().indexOf('android') !== -1;
-export const isChromium = /Chrome/.test(navigator.userAgent) && /Google Inc/.test(navigator.vendor);
-
-export const ctx = typeof(window) !== 'undefined' ? window : self;
-
-// https://stackoverflow.com/a/58065241
-export const isAppleMobile = (/iPad|iPhone|iPod/.test(navigator.platform) ||
-  (navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1)) &&
-  !(ctx as any).MSStream;
-
-export const isSafari = !!('safari' in ctx) || !!(userAgent && (/\b(iPad|iPhone|iPod)\b/.test(userAgent) || (!!userAgent.match('Safari') && !userAgent.match('Chrome'))))/*  || true */;
-export const isFirefox = navigator.userAgent.toLowerCase().indexOf('firefox') > -1;
-
-export const isMobileSafari = isSafari && isAppleMobile;
-
-export const isMobile = /* screen.width && screen.width < 480 ||  */navigator.maxTouchPoints > 0 && navigator.userAgent.search(/iOS|iPhone OS|Android|BlackBerry|BB10|Series ?[64]0|J2ME|MIDP|opera mini|opera mobi|mobi.+Gecko|Windows Phone/i) != -1;
diff --git a/src/index.ts b/src/index.ts
index 0fbe0a6b..bf76910d 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -9,8 +9,8 @@ import blurActiveElement from './helpers/dom/blurActiveElement';
 import { cancelEvent } from './helpers/dom/cancelEvent';
 import { IS_STICKY_INPUT_BUGGED } from './helpers/dom/fixSafariStickyInputFocusing';
 import loadFonts from './helpers/dom/loadFonts';
-import IS_EMOJI_SUPPORTED from './helpers/emojiSupport';
-import { isMobileSafari } from './helpers/userAgent';
+import IS_EMOJI_SUPPORTED from './environment/emojiSupport';
+import { IS_MOBILE_SAFARI } from './environment/userAgent';
 import './materialize.scss';
 import './scss/style.scss';
 import './scss/tgico.scss';
@@ -67,7 +67,7 @@ console.timeEnd('get storage1'); */
       const vh = (setViewportVH && !rootScope.default.isOverlayActive ? w.height || w.innerHeight : window.innerHeight) * 0.01;
       if(lastVH === vh) {
         return;
-      } else if(touchSupport.isTouchSupported && lastVH < vh && (vh - lastVH) > 1) {
+      } else if(touchSupport.IS_TOUCH_SUPPORTED && lastVH < vh && (vh - lastVH) > 1) {
         blurActiveElement(); // (Android) fix blurring inputs when keyboard is being closed (e.g. closing keyboard by back arrow and touching a bubble)
       }
 
@@ -101,8 +101,8 @@ console.timeEnd('get storage1'); */
 
     const [_, touchSupport, userAgent, rootScope, appStateManager, I18n] = await Promise.all([
       import('./lib/polyfill'),
-      import('./helpers/touchSupport'),
-      import('./helpers/userAgent'),
+      import('./environment/touchSupport'),
+      import('./environment/userAgent'),
       import('./lib/rootScope'),
       import('./lib/appManagers/appStateManager'),
       import('./lib/langPack'),
@@ -146,7 +146,7 @@ console.timeEnd('get storage1'); */
       });
     }
 
-    if(userAgent.isFirefox && !IS_EMOJI_SUPPORTED) {
+    if(userAgent.IS_FIREFOX && !IS_EMOJI_SUPPORTED) {
       document.addEventListener('dragstart', (e) => {
         const target = e.target as HTMLElement;
         if(target.tagName === 'IMG' && target.classList.contains('emoji')) {
@@ -164,23 +164,23 @@ console.timeEnd('get storage1'); */
       }
     });
 
-    if(userAgent.isFirefox) {
+    if(userAgent.IS_FIREFOX) {
       document.documentElement.classList.add('is-firefox');
     }
 
-    if(userAgent.isApple) {
-      if(userAgent.isSafari) {
+    if(userAgent.IS_APPLE) {
+      if(userAgent.IS_SAFARI) {
         document.documentElement.classList.add('is-safari');
       }
       
       document.documentElement.classList.add('emoji-supported');
 
-      if(userAgent.isAppleMobile) {
+      if(userAgent.IS_APPLE_MOBILE) {
         document.documentElement.classList.add('is-ios');
       } else {
         document.documentElement.classList.add('is-mac');
       }
-    } else if(userAgent.isAndroid) {
+    } else if(userAgent.IS_ANDROID) {
       document.documentElement.classList.add('is-android');
 
       /* document.addEventListener('focusin', (e) => {
@@ -193,7 +193,7 @@ console.timeEnd('get storage1'); */
       }, {passive: true}); */
     }
 
-    if(!touchSupport.isTouchSupported) {
+    if(!touchSupport.IS_TOUCH_SUPPORTED) {
       document.documentElement.classList.add('no-touch');
     } else {
       document.documentElement.classList.add('is-touch');
@@ -257,7 +257,7 @@ console.timeEnd('get storage1'); */
       let scrollable: HTMLElement;
       if(el) {
         scrollable = el.querySelector('.scrollable') as HTMLElement;
-        if((!touchSupport.isTouchSupported || isMobileSafari)) {
+        if((!touchSupport.IS_TOUCH_SUPPORTED || IS_MOBILE_SAFARI)) {
           scrollable.classList.add('no-scrollbar');
         }
 
diff --git a/src/lib/appManagers/appDialogsManager.ts b/src/lib/appManagers/appDialogsManager.ts
index f96198c9..944f2d81 100644
--- a/src/lib/appManagers/appDialogsManager.ts
+++ b/src/lib/appManagers/appDialogsManager.ts
@@ -15,7 +15,7 @@ import { ripple } from "../../components/ripple";
 //import Scrollable from "../../components/scrollable";
 import Scrollable, { ScrollableX, SliceSides } from "../../components/scrollable";
 import { formatDateAccordingToTodayNew } from "../../helpers/date";
-import { isSafari } from "../../helpers/userAgent";
+import { IS_SAFARI } from "../../environment/userAgent";
 import { logger, LogTypes } from "../logger";
 import { RichTextProcessor } from "../richtextprocessor";
 import rootScope from "../rootScope";
@@ -45,7 +45,7 @@ import appChatsManager from "./appChatsManager";
 import { renderImageFromUrlPromise } from "../../helpers/dom/renderImageFromUrl";
 import { fastRaf, fastRafConventional, fastRafPromise } from "../../helpers/schedulers";
 import SortedUserList from "../../components/sortedUserList";
-import { isTouchSupported } from "../../helpers/touchSupport";
+import { IS_TOUCH_SUPPORTED } from "../../environment/touchSupport";
 import handleTabSwipe from "../../helpers/dom/handleTabSwipe";
 import windowSize from "../../helpers/windowSize";
 import isInDOM from "../../helpers/dom/isInDOM";
@@ -202,7 +202,7 @@ export class AppDialogsManager {
       });
     } */
 
-    if(isTouchSupported) {
+    if(IS_TOUCH_SUPPORTED) {
       handleTabSwipe(this.folders.container, (next) => {
         const prevId = selectTab.prevId();
         selectTab(next ? prevId + 1 : prevId - 1);
@@ -1100,7 +1100,7 @@ export class AppDialogsManager {
 
       const saveLength = 10;
 
-      const sliceFromStart = isSafari ? [] : children.slice(0, Math.max(0, firstIndex - saveLength));
+      const sliceFromStart = IS_SAFARI ? [] : children.slice(0, Math.max(0, firstIndex - saveLength));
       const sliceFromEnd = children.slice(lastIndex + saveLength);
 
       /* if(sliceFromStart.length !== sliceFromEnd.length) {
diff --git a/src/lib/appManagers/appDocsManager.ts b/src/lib/appManagers/appDocsManager.ts
index 55fd5ac2..4c90eb9e 100644
--- a/src/lib/appManagers/appDocsManager.ts
+++ b/src/lib/appManagers/appDocsManager.ts
@@ -15,7 +15,6 @@ import { Document, InputFileLocation, InputMedia, PhotoSize } from '../../layer'
 import referenceDatabase, { ReferenceContext } from '../mtproto/referenceDatabase';
 import opusDecodeController from '../opusDecodeController';
 import { RichTextProcessor } from '../richtextprocessor';
-import webpWorkerController from '../webp/webpWorkerController';
 import appDownloadManager, { DownloadBlob } from './appDownloadManager';
 import appPhotosManager from './appPhotosManager';
 import blur from '../../helpers/blur';
@@ -23,11 +22,16 @@ import apiManager from '../mtproto/mtprotoworker';
 import { MOUNT_CLASS_TO } from '../../config/debug';
 import { getFullDate } from '../../helpers/date';
 import rootScope from '../rootScope';
+import IS_WEBP_SUPPORTED from '../../environment/webpSupport';
 
 export type MyDocument = Document.document;
 
 // TODO: если залить картинку файлом, а потом перезайти в диалог - превьюшка заново скачается
 
+const EXTENSION_MIME_TYPE_MAP: {[key: string]: string} = {
+  mov: 'video/quicktime'
+};
+
 export class AppDocsManager {
   private docs: {[docId: string]: MyDocument} = {};
   private savingLottiePreview: {[docId: string]: true} = {};
@@ -135,7 +139,7 @@ export class AppDocsManager {
           }
 
           // * there can be no thumbs, then it is a document
-          if(/* apiDoc.thumbs &&  */doc.mime_type === 'image/webp' && (doc.thumbs || webpWorkerController.isWebpSupported())) {
+          if(/* apiDoc.thumbs &&  */doc.mime_type === 'image/webp' && (doc.thumbs || IS_WEBP_SUPPORTED)) {
             doc.type = 'sticker';
             doc.sticker = 1;
           }
@@ -158,28 +162,32 @@ export class AppDocsManager {
     });
     
     if(!doc.mime_type) {
-      switch(doc.type) {
-        case 'gif':
-        case 'video':
-        case 'round':
-          doc.mime_type = 'video/mp4';
-          break;
-        case 'sticker':
-          doc.mime_type = 'image/webp';
-          break;
-        case 'audio':
-          doc.mime_type = 'audio/mpeg';
-          break;
-        case 'voice':
-          doc.mime_type = 'audio/ogg';
-          break;
-        default:
-          doc.mime_type = 'application/octet-stream';
-          break;
+      const ext = (doc.file_name || '').split('.').pop();
+      const mappedMimeType = ext && EXTENSION_MIME_TYPE_MAP[ext.toLowerCase()];
+      if(mappedMimeType) {
+        doc.mime_type = mappedMimeType;
+      } else {
+        switch(doc.type) {
+          case 'gif':
+          case 'video':
+          case 'round':
+            doc.mime_type = 'video/mp4';
+            break;
+          case 'sticker':
+            doc.mime_type = 'image/webp';
+            break;
+          case 'audio':
+            doc.mime_type = 'audio/mpeg';
+            break;
+          case 'voice':
+            doc.mime_type = 'audio/ogg';
+            break;
+          default:
+            doc.mime_type = 'application/octet-stream';
+            break;
+        }
       }
-    }
-
-    if(doc.mime_type === 'application/pdf') {
+    } else if(doc.mime_type === 'application/pdf') {
       doc.type = 'pdf';
     }
 
diff --git a/src/lib/appManagers/appImManager.ts b/src/lib/appManagers/appImManager.ts
index b10615be..f8769509 100644
--- a/src/lib/appManagers/appImManager.ts
+++ b/src/lib/appManagers/appImManager.ts
@@ -26,7 +26,7 @@ import appStickersManager from './appStickersManager';
 import appWebPagesManager from './appWebPagesManager';
 import PopupNewMedia from '../../components/popups/newMedia';
 import MarkupTooltip from '../../components/chat/markupTooltip';
-import { isTouchSupported } from '../../helpers/touchSupport';
+import { IS_TOUCH_SUPPORTED } from '../../environment/touchSupport';
 import appPollsManager from './appPollsManager';
 import SetTransition from '../../components/singleTransition';
 import ChatDragAndDrop from '../../components/chat/dragAndDrop';
@@ -67,13 +67,14 @@ import { pause } from '../../helpers/schedulers/pause';
 import appMessagesIdsManager from './appMessagesIdsManager';
 import { InternalLink, InternalLinkTypeMap, INTERNAL_LINK_TYPE } from './internalLink';
 import RichTextProcessor from '../richtextprocessor';
+import MEDIA_MIME_TYPES_SUPPORTED from '../../environment/mediaMimeTypesSupport';
 
 //console.log('appImManager included33!');
 
 appSidebarLeft; // just to include
 
 export const CHAT_ANIMATION_GROUP = 'chat';
-const FOCUS_EVENT_NAME = isTouchSupported ? 'touchstart' : 'mousemove';
+const FOCUS_EVENT_NAME = IS_TOUCH_SUPPORTED ? 'touchstart' : 'mousemove';
 
 export type ChatSavedPosition = {
   mids: number[], 
@@ -495,7 +496,7 @@ export class AppImManager {
         e.target !== chat.input.messageInput && 
         target.tagName !== 'INPUT' && 
         !target.hasAttribute('contenteditable') && 
-        !isTouchSupported && 
+        !IS_TOUCH_SUPPORTED && 
         (!mediaSizes.isMobile || this.tabId === 1) && 
         !this.chat.selection.isSelecting && 
         !this.chat.input.recording) {
@@ -891,7 +892,7 @@ export class AppImManager {
       appSidebarRight.sharedMediaTab.renderNewMessages(message.peerId, [mid]);
     });
 
-    if(!isTouchSupported) {
+    if(!IS_TOUCH_SUPPORTED) {
       this.attachDragAndDropListeners();
     }
 
@@ -917,10 +918,10 @@ export class AppImManager {
       }
 
       if(mount && !drops.length) {
-        const types: string[] = await getFilesFromEvent(e, true)
+        const types: string[] = await getFilesFromEvent(e, true);
         const force = isFiles && !types.length; // * can't get file items not from 'drop' on Safari
         
-        const foundMedia = types.filter(t => ['image', 'video'].includes(t.split('/')[0])).length;
+        const foundMedia = types.filter(t => MEDIA_MIME_TYPES_SUPPORTED.has(t)).length;
         const foundDocuments = types.length - foundMedia;
   
         this.log('drag files', types);
@@ -1029,12 +1030,12 @@ export class AppImManager {
     
     getFilesFromEvent(e).then((files: File[]) => {
       if(files.length) {
-        if(attachType === 'media' && files.find(file => !['image', 'video'].includes(file.type.split('/')[0]))) {
+        if(/* attachType === 'media' &&  */files.find(file => !MEDIA_MIME_TYPES_SUPPORTED.has(file.type))) {
           attachType = 'document';
         }
   
         const chatInput = this.chat.input;
-        chatInput.willAttachType = attachType || (files[0].type.indexOf('image/') === 0 ? 'media' : "document");
+        chatInput.willAttachType = attachType || (MEDIA_MIME_TYPES_SUPPORTED.has(files[0].type) ? 'media' : "document");
         new PopupNewMedia(this.chat, files, chatInput.willAttachType);
       }
     });
diff --git a/src/lib/appManagers/appNotificationsManager.ts b/src/lib/appManagers/appNotificationsManager.ts
index d3b0dc1d..0f68402f 100644
--- a/src/lib/appManagers/appNotificationsManager.ts
+++ b/src/lib/appManagers/appNotificationsManager.ts
@@ -15,7 +15,7 @@ import { CancellablePromise, deferredPromise } from "../../helpers/cancellablePr
 import { tsNow } from "../../helpers/date";
 import { deepEqual } from "../../helpers/object";
 import { convertInputKeyToKey } from "../../helpers/string";
-import { isMobile } from "../../helpers/userAgent";
+import { IS_MOBILE } from "../../environment/userAgent";
 import { InputNotifyPeer, InputPeerNotifySettings, NotifyPeer, PeerNotifySettings, Update } from "../../layer";
 import I18n from "../langPack";
 import apiManager from "../mtproto/mtprotoworker";
@@ -209,7 +209,7 @@ export class AppNotificationsManager {
   }
 
   private toggleToggler(enable = rootScope.idle.isIDLE) {
-    if(isMobile) return;
+    if(IS_MOBILE) return;
 
     const resetTitle = () => {
       this.titleChanged = false;
@@ -616,7 +616,7 @@ export class AppNotificationsManager {
     }
     this.notificationsShown[key] = notification;
 
-    if(!isMobile) {
+    if(!IS_MOBILE) {
       setTimeout(() => {
         this.hide(key);
       }, 8000);
diff --git a/src/lib/appManagers/appPhotosManager.ts b/src/lib/appManagers/appPhotosManager.ts
index 6594d933..971e9336 100644
--- a/src/lib/appManagers/appPhotosManager.ts
+++ b/src/lib/appManagers/appPhotosManager.ts
@@ -14,7 +14,7 @@ import { bytesFromHex } from "../../helpers/bytes";
 import { CancellablePromise } from "../../helpers/cancellablePromise";
 import { getFileNameByLocation } from "../../helpers/fileName";
 import { safeReplaceArrayInObject, isObject } from "../../helpers/object";
-import { isSafari } from "../../helpers/userAgent";
+import { IS_SAFARI } from "../../environment/userAgent";
 import { InputFileLocation, InputMedia, InputPhoto, Photo, PhotoSize, PhotosPhotos } from "../../layer";
 import apiManager from "../mtproto/mtprotoworker";
 import referenceDatabase, { ReferenceContext } from "../mtproto/referenceDatabase";
@@ -165,7 +165,7 @@ export class AppPhotosManager {
 
     let mimeType: string;
     if(isSticker) {
-      mimeType = isSafari ? 'image/png' : 'image/webp';
+      mimeType = IS_SAFARI ? 'image/png' : 'image/webp';
     } else {
       mimeType = 'image/jpeg';
     }
diff --git a/src/lib/appManagers/appStateManager.ts b/src/lib/appManagers/appStateManager.ts
index 2368ec83..3a87f0b8 100644
--- a/src/lib/appManagers/appStateManager.ts
+++ b/src/lib/appManagers/appStateManager.ts
@@ -19,7 +19,7 @@ import App from '../../config/app';
 import DEBUG, { MOUNT_CLASS_TO } from '../../config/debug';
 import AppStorage from '../storage';
 import { Chat } from '../../layer';
-import { isMobile } from '../../helpers/userAgent';
+import { IS_MOBILE } from '../../environment/userAgent';
 import DATABASE_STATE from '../../config/databases/state';
 import sessionStorage from '../sessionStorage';
 import { nextRandomUint } from '../../helpers/random';
@@ -112,7 +112,7 @@ export const STATE_INIT: State = {
   recentSearch: [],
   version: STATE_VERSION,
   authState: {
-    _: isMobile ? 'authStateSignIn' : 'authStateSignQr'
+    _: IS_MOBILE ? 'authStateSignIn' : 'authStateSignQr'
   },
   hiddenPinnedMessages: {},
   settings: {
diff --git a/src/lib/lottieLoader.ts b/src/lib/lottieLoader.ts
index 3369758d..ff4659fc 100644
--- a/src/lib/lottieLoader.ts
+++ b/src/lib/lottieLoader.ts
@@ -11,7 +11,7 @@ import EventListenerBase from "../helpers/eventListenerBase";
 import mediaSizes from "../helpers/mediaSizes";
 import { clamp } from '../helpers/number';
 import { pause } from '../helpers/schedulers/pause';
-import { isAndroid, isApple, isAppleMobile, isSafari } from "../helpers/userAgent";
+import { IS_ANDROID, IS_APPLE, IS_APPLE_MOBILE, IS_SAFARI } from "../environment/userAgent";
 import { logger, LogTypes } from "./logger";
 import apiManager from "./mtproto/mtprotoworker";
 
@@ -107,7 +107,7 @@ export class RLottiePlayer extends EventListenerBase<{
     // * Skip ratio (30fps)
     let skipRatio: number;
     if(options.skipRatio !== undefined) skipRatio = options.skipRatio;
-    else if((isAndroid || isAppleMobile || (isApple && !isSafari)) && this.width < 100 && this.height < 100) {
+    else if((IS_ANDROID || IS_APPLE_MOBILE || (IS_APPLE && !IS_SAFARI)) && this.width < 100 && this.height < 100) {
       skipRatio = 0.5;
     }
 
@@ -125,7 +125,7 @@ export class RLottiePlayer extends EventListenerBase<{
         this.height = Math.round(this.height * pixelRatio);
       } else if(pixelRatio > 1) {
         if(this.width > 100 && this.height > 100) {
-          if(isApple || !mediaSizes.isMobile) {
+          if(IS_APPLE || !mediaSizes.isMobile) {
             /* this.width = Math.round(this.width * (pixelRatio - 1));
             this.height = Math.round(this.height * (pixelRatio - 1)); */
             this.width = Math.round(this.width * pixelRatio);
@@ -146,7 +146,7 @@ export class RLottiePlayer extends EventListenerBase<{
     // * Cache frames params
     if(!options.noCache/*  && false */) {
       // проверка на размер уже после скейлинга, сделано для попапа и сайдбара, где стикеры 80х80 и 68х68, туда нужно 75%
-      if(isApple && this.width > 100 && this.height > 100) {
+      if(IS_APPLE && this.width > 100 && this.height > 100) {
         this.cachingDelta = 2; //2 // 50%
       } else if(this.width < 100 && this.height < 100) {
         this.cachingDelta = Infinity; // 100%
@@ -303,7 +303,7 @@ export class RLottiePlayer extends EventListenerBase<{
   public requestFrame(frameNo: number) {
     if(this.frames[frameNo]) {
       this.renderFrame(this.frames[frameNo], frameNo);
-    } else if(isSafari) {
+    } else if(IS_SAFARI) {
       this.sendQuery('renderFrame', frameNo);
     } else {
       if(!this.clamped.length) { // fix detached
@@ -480,7 +480,7 @@ class QueryableWorker extends EventListenerBase<any> {
   }
 
   public sendQuery(queryMethod: string, ...args: any[]) {
-    if(isSafari) {
+    if(IS_SAFARI) {
       this.worker.postMessage({
         'queryMethod': queryMethod,
         'queryMethodArguments': args
diff --git a/src/lib/mediaPlayer.ts b/src/lib/mediaPlayer.ts
index 3bc060d5..4d12d5c2 100644
--- a/src/lib/mediaPlayer.ts
+++ b/src/lib/mediaPlayer.ts
@@ -5,8 +5,8 @@
  */
 
 import appMediaPlaybackController from "../components/appMediaPlaybackController";
-import { isAppleMobile } from "../helpers/userAgent";
-import { isTouchSupported } from "../helpers/touchSupport";
+import { IS_APPLE_MOBILE } from "../environment/userAgent";
+import { IS_TOUCH_SUPPORTED } from "../environment/touchSupport";
 import RangeSelector from "../components/rangeSelector";
 import { onVideoLoad } from "../helpers/files";
 import { cancelEvent } from "../helpers/dom/cancelEvent";
@@ -314,12 +314,12 @@ export default class VideoPlayer extends EventListenerBase<{
       });
 
       this.listenerSetter.add(video)('click', () => {
-        if(!isTouchSupported) {
+        if(!IS_TOUCH_SUPPORTED) {
           this.togglePlay();
         }
       });
 
-      if(isTouchSupported) {
+      if(IS_TOUCH_SUPPORTED) {
         this.listenerSetter.add(player)('click', () => {
           this.toggleControls();
         });
@@ -390,7 +390,7 @@ export default class VideoPlayer extends EventListenerBase<{
       }); */
 
       this.listenerSetter.add(video)('dblclick', () => {
-        if(!isTouchSupported) {
+        if(!IS_TOUCH_SUPPORTED) {
           this.toggleFullScreen(fullScreenButton);
         }
       });
@@ -537,7 +537,7 @@ export default class VideoPlayer extends EventListenerBase<{
     const player = this.wrapper;
 
     // * https://caniuse.com/#feat=fullscreen
-    if(isAppleMobile) {
+    if(IS_APPLE_MOBILE) {
       const video = this.video as any;
       video.webkitEnterFullscreen();
       video.enterFullscreen();
diff --git a/src/lib/mtproto/apiFileManager.ts b/src/lib/mtproto/apiFileManager.ts
index 1af81b7a..cea29ca6 100644
--- a/src/lib/mtproto/apiFileManager.ts
+++ b/src/lib/mtproto/apiFileManager.ts
@@ -27,7 +27,7 @@ import apiManager from "./apiManager";
 import { isWebpSupported } from "./mtproto.worker";
 import { bytesToHex } from "../../helpers/bytes";
 import assumeType from "../../helpers/assumeType";
-import { ctx } from "../../helpers/userAgent";
+import ctx from "../../environment/ctx";
 
 type Delayed = {
   offset: number, 
diff --git a/src/lib/mtproto/apiManager.ts b/src/lib/mtproto/apiManager.ts
index e5c9fb75..9ea03785 100644
--- a/src/lib/mtproto/apiManager.ts
+++ b/src/lib/mtproto/apiManager.ts
@@ -23,11 +23,12 @@ import type { MethodDeclMap } from '../../layer';
 import { CancellablePromise, deferredPromise } from '../../helpers/cancellablePromise';
 import { bytesFromHex, bytesToHex } from '../../helpers/bytes';
 //import { clamp } from '../../helpers/number';
-import { ctx, isSafari } from '../../helpers/userAgent';
+import { IS_SAFARI } from '../../environment/userAgent';
 import App from '../../config/app';
 import { MOUNT_CLASS_TO } from '../../config/debug';
 import IDBStorage from '../idb';
 import CryptoWorker from "../crypto/cryptoworker";
+import ctx from '../../environment/ctx';
 
 /// #if !MTPROTO_WORKER
 import rootScope from '../rootScope';
@@ -203,7 +204,7 @@ export class ApiManager {
 
     /// #if MTPROTO_HTTP_UPLOAD
     // @ts-ignore
-    const transportType: TransportType = connectionType === 'upload' && isSafari ? 'https' : 'websocket';
+    const transportType: TransportType = connectionType === 'upload' && IS_SAFARI ? 'https' : 'websocket';
     //const transportType: TransportType = connectionType !== 'client' ? 'https' : 'websocket';
     /// #else
     // @ts-ignore
diff --git a/src/lib/mtproto/dcConfigurator.ts b/src/lib/mtproto/dcConfigurator.ts
index 6968a206..8da77c88 100644
--- a/src/lib/mtproto/dcConfigurator.ts
+++ b/src/lib/mtproto/dcConfigurator.ts
@@ -19,7 +19,7 @@ import HTTP from './transports/http';
 /// #if !MTPROTO_HTTP
 import Socket from './transports/websocket';
 import TcpObfuscated from './transports/tcpObfuscated';
-import { isSafari } from '../../helpers/userAgent';
+import { IS_SAFARI } from '../../environment/userAgent';
 import { isWebWorker } from '../../helpers/context';
 import SocketProxied from './transports/socketProxied';
 import App from '../../config/app';
@@ -64,7 +64,7 @@ export class DcConfigurator {
 
     const retryTimeout = connectionType === 'client' ? 10000 : 10000;
 
-    const oooohLetMeLive: MTConnectionConstructable = (isSafari && isWebWorker && typeof(SocketProxied) !== 'undefined') /* || true */ ? SocketProxied : Socket;
+    const oooohLetMeLive: MTConnectionConstructable = (IS_SAFARI && isWebWorker && typeof(SocketProxied) !== 'undefined') /* || true */ ? SocketProxied : Socket;
 
     return new TcpObfuscated(oooohLetMeLive, dcId, chosenServer, logSuffix, retryTimeout);
   };
diff --git a/src/lib/mtproto/mtproto.worker.ts b/src/lib/mtproto/mtproto.worker.ts
index edf94f7f..d354fac1 100644
--- a/src/lib/mtproto/mtproto.worker.ts
+++ b/src/lib/mtproto/mtproto.worker.ts
@@ -15,12 +15,12 @@ import apiManager from "./apiManager";
 import cryptoWorker from "../crypto/cryptoworker";
 import networkerFactory from "./networkerFactory";
 import apiFileManager from './apiFileManager';
-import { ctx } from '../../helpers/userAgent';
 import { notifyAll } from '../../helpers/context';
 import CacheStorageController from '../cacheStorage';
 import sessionStorage from '../sessionStorage';
 import { socketsProxied } from './transports/socketProxied';
 import { bytesToHex } from '../../helpers/bytes';
+import ctx from '../../environment/ctx';
 
 let webpSupported = false;
 export const isWebpSupported = () => {
diff --git a/src/lib/mtproto/mtprotoworker.ts b/src/lib/mtproto/mtprotoworker.ts
index e3ff3701..6993c19c 100644
--- a/src/lib/mtproto/mtprotoworker.ts
+++ b/src/lib/mtproto/mtprotoworker.ts
@@ -30,6 +30,7 @@ import { SocketProxyTask } from './transports/socketProxied';
 import telegramMeWebManager from './telegramMeWebManager';
 import { CacheStorageDbName } from '../cacheStorage';
 import { pause } from '../../helpers/schedulers/pause';
+import IS_WEBP_SUPPORTED from '../../environment/webpSupport';
 
 type Task = {
   taskId: number,
@@ -318,7 +319,7 @@ export class ApiManagerProxy extends CryptoWorkerMethods {
       this.postMessagesWaiting.forEach(args => this.postMessage(...args));
       this.postMessagesWaiting.length = 0;
 
-      const isWebpSupported = webpWorkerController.isWebpSupported();
+      const isWebpSupported = IS_WEBP_SUPPORTED;
       this.log('WebP supported:', isWebpSupported);
       this.postMessage({type: 'webpSupport', payload: isWebpSupported});
       this.postMessage({type: 'userAgent', payload: navigator.userAgent});
diff --git a/src/lib/mtproto/webPushApiManager.ts b/src/lib/mtproto/webPushApiManager.ts
index 505391b2..3d0dcb41 100644
--- a/src/lib/mtproto/webPushApiManager.ts
+++ b/src/lib/mtproto/webPushApiManager.ts
@@ -17,7 +17,7 @@ import rootScope from "../rootScope";
 import { ServiceWorkerNotificationsClearTask, ServiceWorkerPingTask, ServiceWorkerPushClickTask } from "../serviceWorker/index.service";
 import apiManager from "./mtprotoworker";
 import I18n, { LangPackKey } from "../langPack";
-import { isMobile } from "../../helpers/userAgent";
+import { IS_MOBILE } from "../../environment/userAgent";
 import appRuntimeManager from "../appManagers/appRuntimeManager";
 
 export type PushSubscriptionNotifyType = 'init' | 'subscribe' | 'unsubscribe';
@@ -163,8 +163,8 @@ export class WebPushApiManager {
 
     const lang: ServiceWorkerPingTask['payload']['lang'] = {} as any;
     const ACTIONS_LANG_MAP: Record<keyof ServiceWorkerPingTask['payload']['lang'], LangPackKey> = {
-      push_action_mute1d: isMobile ? 'PushNotification.Action.Mute1d.Mobile' : 'PushNotification.Action.Mute1d',
-      push_action_settings: isMobile ? 'PushNotification.Action.Settings.Mobile' : 'PushNotification.Action.Settings',
+      push_action_mute1d: IS_MOBILE ? 'PushNotification.Action.Mute1d.Mobile' : 'PushNotification.Action.Mute1d',
+      push_action_settings: IS_MOBILE ? 'PushNotification.Action.Settings.Mobile' : 'PushNotification.Action.Settings',
       push_message_nopreview: 'PushNotification.Message.NoPreview'
     };
 
diff --git a/src/lib/opusDecodeController.ts b/src/lib/opusDecodeController.ts
index 4d4639b2..2dccc158 100644
--- a/src/lib/opusDecodeController.ts
+++ b/src/lib/opusDecodeController.ts
@@ -5,7 +5,7 @@
  */
 
 import { MOUNT_CLASS_TO } from "../config/debug";
-import { isSafari } from "../helpers/userAgent";
+import { IS_SAFARI } from "../environment/userAgent";
 import { logger, LogTypes } from "./logger";
 
 type Result = {
@@ -72,7 +72,7 @@ export class OpusDecodeController {
         this.wavWorker.postMessage({
           command: 'encode',
           buffers: e.data
-        }, isSafari ? undefined : data.map((typedArray: Uint8Array) => typedArray.buffer));
+        }, IS_SAFARI ? undefined : data.map((typedArray: Uint8Array) => typedArray.buffer));
       }
     });
   }
@@ -136,7 +136,7 @@ export class OpusDecodeController {
         command: 'decode',
         pages: task.pages,
         waveform: task.withWaveform
-      }, isSafari ? undefined : [task.pages.buffer]);
+      }, IS_SAFARI ? undefined : [task.pages.buffer]);
     //}, 1e3);
 
     task.timeout = window.setTimeout(() => {
diff --git a/src/lib/richtextprocessor.ts b/src/lib/richtextprocessor.ts
index 35b1a1ac..fa2e5746 100644
--- a/src/lib/richtextprocessor.ts
+++ b/src/lib/richtextprocessor.ts
@@ -15,9 +15,9 @@ import emojiRegExp from '../vendor/emoji/regex';
 import { encodeEmoji, toCodePoints } from '../vendor/emoji';
 import { MessageEntity } from '../layer';
 import { encodeEntities } from '../helpers/string';
-import { isSafari } from '../helpers/userAgent';
+import { IS_SAFARI } from '../environment/userAgent';
 import { MOUNT_CLASS_TO } from '../config/debug';
-import IS_EMOJI_SUPPORTED from '../helpers/emojiSupport';
+import IS_EMOJI_SUPPORTED from '../environment/emojiSupport';
 
 const EmojiHelper = {
   emojiMap: (code: string) => { return code; },
@@ -115,8 +115,6 @@ for(let i in markdownEntities) {
 }
 
 namespace RichTextProcessor {
-  export const emojiSupported = IS_EMOJI_SUPPORTED;
-
   export function getEmojiSpritesheetCoords(emojiCode: string) {
     let unified = encodeEmoji(emojiCode).replace(/-?fe0f/g, '');
   
@@ -406,7 +404,7 @@ namespace RichTextProcessor {
     currentEntities.push(...filtered);
     currentEntities.sort((a, b) => a.offset - b.offset);
 
-    if(!emojiSupported) { // fix splitted emoji. messageEntityTextUrl can split the emoji if starts before its end (e.g. on fe0f)
+    if(!IS_EMOJI_SUPPORTED) { // fix splitted emoji. messageEntityTextUrl can split the emoji if starts before its end (e.g. on fe0f)
       for(let i = 0; i < currentEntities.length; ++i) {
         const entity = currentEntities[i];
         if(entity._ === 'messageEntityEmoji') {
@@ -507,7 +505,7 @@ namespace RichTextProcessor {
 
         case 'messageEntityStrike': {
           if(options.wrappingDraft) {
-            const styleName = isSafari ? 'text-decoration' : 'text-decoration-line';
+            const styleName = IS_SAFARI ? 'text-decoration' : 'text-decoration-line';
             insertPart(entity, `<span style="${styleName}: line-through;">`, '</span>');
           } else {
             insertPart(entity, '<del>', '</del>');
@@ -518,7 +516,7 @@ namespace RichTextProcessor {
 
         case 'messageEntityUnderline': {
           if(options.wrappingDraft) {
-            const styleName = isSafari ? 'text-decoration' : 'text-decoration-line';
+            const styleName = IS_SAFARI ? 'text-decoration' : 'text-decoration-line';
             insertPart(entity, `<span style="${styleName}: underline;">`, '</span>');
           } else {
             insertPart(entity, '<u>', '</u>');
@@ -571,9 +569,9 @@ namespace RichTextProcessor {
         }
 
         case 'messageEntityEmoji': {
-          //if(!(options.wrappingDraft && emojiSupported)) { // * fix safari emoji
-          if(!emojiSupported) { // no wrapping needed
-            // if(emojiSupported) { // ! contenteditable="false" нужен для поля ввода, иначе там будет меняться шрифт в Safari, или же рендерить смайлик напрямую, без контейнера
+          //if(!(options.wrappingDraft && IS_EMOJI_SUPPORTED)) { // * fix safari emoji
+          if(!IS_EMOJI_SUPPORTED) { // no wrapping needed
+            // if(IS_EMOJI_SUPPORTED) { // ! contenteditable="false" нужен для поля ввода, иначе там будет меняться шрифт в Safari, или же рендерить смайлик напрямую, без контейнера
             //   insertPart(entity, '<span class="emoji">', '</span>');
             // } else {
               insertPart(entity, `<img src="assets/img/emoji/${entity.unicode}.png" alt="`, `" class="emoji">`);
@@ -581,10 +579,10 @@ namespace RichTextProcessor {
           //} else if(options.mustWrapEmoji) {
           } else if(!options.wrappingDraft) {
             insertPart(entity, '<span class="emoji">', '</span>');
-          } else if(!isSafari) {
+          } else if(!IS_SAFARI) {
             insertPart(entity, '<span class="emoji" contenteditable="false">', '</span>');
           }
-          /* if(!emojiSupported) {
+          /* if(!IS_EMOJI_SUPPORTED) {
             insertPart(entity, `<img src="assets/img/emoji/${entity.unicode}.png" alt="`, `" class="emoji">`);
           } */
 
@@ -723,7 +721,7 @@ namespace RichTextProcessor {
   }
 
   export function fixEmoji(text: string, entities?: MessageEntity[]) {
-    /* if(!emojiSupported) {
+    /* if(!IS_EMOJI_SUPPORTED) {
       return text;
     } */
     // '$`\ufe0f'
@@ -795,7 +793,7 @@ namespace RichTextProcessor {
   }
   
   export function wrapPlainText(text: string) {
-    if(emojiSupported) {
+    if(IS_EMOJI_SUPPORTED) {
       return text;
     }
   
diff --git a/src/lib/serviceWorker/push.ts b/src/lib/serviceWorker/push.ts
index bd77201c..4165ef94 100644
--- a/src/lib/serviceWorker/push.ts
+++ b/src/lib/serviceWorker/push.ts
@@ -11,7 +11,7 @@
 
 import { Database } from "../../config/databases";
 import DATABASE_STATE from "../../config/databases/state";
-import { isFirefox } from "../../helpers/userAgent";
+import { IS_FIREFOX } from "../../environment/userAgent";
 import IDBStorage from "../idb";
 import { log, ServiceWorkerPingTask, ServiceWorkerPushClickTask } from "./index.service";
 
@@ -256,7 +256,7 @@ export function closeAllNotifications() {
 }
 
 function userInvisibleIsSupported() {
-  return isFirefox;
+  return IS_FIREFOX;
 }
 
 function fireNotification(obj: PushNotificationObject, settings: PushStorage['push_settings'], lang: PushStorage['push_lang']) {
diff --git a/src/lib/webp/webpWorkerController.ts b/src/lib/webp/webpWorkerController.ts
index f1b4dd91..50c87aea 100644
--- a/src/lib/webp/webpWorkerController.ts
+++ b/src/lib/webp/webpWorkerController.ts
@@ -20,9 +20,8 @@ export type WebpConvertTask = {
 export class WebpWorkerController {
   private worker: Worker;
   private convertPromises: {[fileName: string]: CancellablePromise<Uint8Array>} = {};
-  private isWebpSupportedCache: boolean;
   
-  init() {
+  private init() {
     this.worker = new WebpWorker();
     this.worker.addEventListener('message', (e) => {
       const payload = (e.data as WebpConvertTask).payload;
@@ -39,7 +38,7 @@ export class WebpWorkerController {
     });
   }
 
-  postMessage(data: WebpConvertTask) {
+  public postMessage(data: WebpConvertTask) {
     if(this.init) {
       this.init();
       this.init = null;
@@ -48,15 +47,7 @@ export class WebpWorkerController {
     this.worker.postMessage(data);
   }
 
-  isWebpSupported() {
-    if(this.isWebpSupportedCache === undefined) {
-      this.isWebpSupportedCache = document.createElement('canvas').toDataURL('image/webp').startsWith('data:image/webp');
-    }
-
-    return this.isWebpSupportedCache;
-  }
-
-  convert(fileName: string, bytes: Uint8Array) {
+  public convert(fileName: string, bytes: Uint8Array) {
     fileName = 'main-' + fileName;
 
     if(this.convertPromises.hasOwnProperty(fileName)) {
diff --git a/src/pages/pageSignIn.ts b/src/pages/pageSignIn.ts
index ef2bffff..8a831f03 100644
--- a/src/pages/pageSignIn.ts
+++ b/src/pages/pageSignIn.ts
@@ -13,9 +13,9 @@ import Page from "./page";
 import InputField from "../components/inputField";
 import CheckboxField from "../components/checkboxField";
 import Button from "../components/button";
-import { isAndroid, isApple, isAppleMobile } from "../helpers/userAgent";
+import { IS_ANDROID, IS_APPLE, IS_APPLE_MOBILE } from "../environment/userAgent";
 import fastSmoothScroll from "../helpers/fastSmoothScroll";
-import { isTouchSupported } from "../helpers/touchSupport";
+import { IS_TOUCH_SUPPORTED } from "../environment/touchSupport";
 import App from "../config/app";
 import I18n, { _i18n, i18n } from "../lib/langPack";
 import lottieLoader from "../lib/lottieLoader";
@@ -41,6 +41,7 @@ import simulateEvent from "../helpers/dom/dispatchEvent";
 import stateStorage from "../lib/stateStorage";
 import rootScope from "../lib/rootScope";
 import TelInputField from "../components/telInputField";
+import IS_EMOJI_SUPPORTED from "../environment/emojiSupport";
 
 //import _countries from '../countries_pretty.json';
 let btnNext: HTMLButtonElement = null, btnQr: HTMLButtonElement;
@@ -117,7 +118,7 @@ let onFirstMount = () => {
         const li = document.createElement('li');
 
         let wrapped = RichTextProcessor.wrapEmojiText(emoji);
-        if(RichTextProcessor.emojiSupported) {
+        if(IS_EMOJI_SUPPORTED) {
           const spanEmoji = document.createElement('span');
           spanEmoji.innerHTML = wrapped;
           li.append(spanEmoji);
@@ -477,7 +478,7 @@ let onFirstMount = () => {
     })//.catch(tryAgain);
   };
 
-  if(!isTouchSupported) {
+  if(!IS_TOUCH_SUPPORTED) {
     setTimeout(() => {
       telEl.focus();
     }, 0);
diff --git a/src/scss/partials/_chatBubble.scss b/src/scss/partials/_chatBubble.scss
index 9b79cb38..05dda5b1 100644
--- a/src/scss/partials/_chatBubble.scss
+++ b/src/scss/partials/_chatBubble.scss
@@ -2294,7 +2294,10 @@ $bubble-margin: .25rem;
 
     .c-ripple__circle {
       background-color: var(--message-out-primary-color);
-      opacity: .08;
+
+      &:not(.hiding) {
+        opacity: .08;
+      }
     }
   }