Issue 5347 - Check for contextMenus API support

lib/filterComposer.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2017 eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 158 matching lines @@
   title: ext.i18n.getMessage("block_element"),
   contexts: ["image", "video", "audio"],
   onclick(page)
   {
     page.sendMessage({type: "composer.content.contextMenuClicked"});
   }
 };
 
 function updateContextMenu(page, filter)
 {
+  // Firefox for Android does not support context menus.
+  // https://bugzilla.mozilla.org/show_bug.cgi?id=1269062
+  if (!("contextMenus" in chrome))
+    return;

[Wladimir Palant, 2017/08/16 13:21:56]

This change won't be necessary any more if my previous comment is addressed.

[Manish Jethani, 2017/08/16 19:39:09]

Done.

+
   page.contextMenus.remove(contextMenuItem);
 
   if (typeof filter == "undefined")
     filter = checkWhitelisted(page);
   if (!filter && Prefs.shouldShowBlockElementMenu && readyPages.has(page))
     page.contextMenus.create(contextMenuItem);
 }
 
 FilterNotifier.on("page.WhitelistingStateRevalidate", updateContextMenu);
 
@@ skipping 62 matching lines @@
 
 port.on("composer.quoteCSS", (message, sender) =>
 {
   return quoteCSS(message.CSS);
 });
 
 ext.pages.onLoading.addListener(page =>
 {
   page.sendMessage({type: "composer.content.finished"});
 });