Fixed bug where you could add generated html pages as bookmarks

app/src/main/java/acr/browser/lightning/fragment/BookmarksFragment.java

@@ -49,6 +49,7 @@ import acr.browser.lightning.dialog.LightningDialogBuilder;
 import acr.browser.lightning.preference.PreferenceManager;
 import acr.browser.lightning.async.ImageDownloadTask;
 import acr.browser.lightning.utils.ThemeUtils;
+import acr.browser.lightning.utils.UrlUtils;
 import acr.browser.lightning.view.LightningView;
 
 /**
@@ -193,6 +194,7 @@ public class BookmarksFragment extends Fragment implements View.OnClickListener,
     @Subscribe
     public void addBookmark(final BrowserEvents.AddBookmark event) {
         final HistoryItem item = new HistoryItem(event.url, event.title);
+        if (!UrlUtils.isSpecialUrl(item.getUrl())) {
             if (mBookmarkManager.addBookmark(item)) {
                 mBookmarks.add(item);
                 Collections.sort(mBookmarks, new BookmarkManager.SortIgnoreCase());
@@ -201,6 +203,7 @@ public class BookmarksFragment extends Fragment implements View.OnClickListener,
                 updateBookmarkIndicator(event.url);
             }
         }
+    }
 
     @Subscribe
     public void currentPageInfo(final BrowserEvents.CurrentPageUrl event) {