Issue 6786 - Switch Safari 12+ users to content blocking API

safari/contentBlocking.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present 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 165 matching lines @@
   });
 }
 
 if (contentBlockingSupported)
 {
   Promise.all([Prefs.untilLoaded,
                FilterNotifier.once("load"),
                legacyAPISupported]).then(resolvedValues =>
   {
     let legacyAPISupported = resolvedValues[2];
-    if (!legacyAPISupported)
+    if (!legacyAPISupported || Services.vc.compare(require("info").applicationVersion, "12") >= 0)
       Prefs.safariContentBlocker = true;
 
     if (Prefs.safariContentBlocker)
       updateContentBlocker(true, legacyAPISupported);
 
     Prefs.on("safariContentBlocker", () =>
     {
       if (!contentBlockingActive && Prefs.safariContentBlocker)
         updateContentBlocker(false, legacyAPISupported);
     });
 
     FilterNotifier.on("filter.behaviorChanged", () =>
     {
       contentBlockListDirty = true;
       if (contentBlockingActive)
         updateContentBlocker(false, legacyAPISupported);
     });
   });
 }
 
 port.on("safari.contentBlockingActive", (msg, sender) =>
 {
   if (!contentBlockingActive && afterContentBlockingFinished)
     return afterContentBlockingFinished;
   return contentBlockingActive;
 });