Issue 6774 - $document doesn't whitelist everything inside iframes in Edge

ext/background.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 541 matching lines @@
         // In Edge requests from internal extension pages
         // (protocol ms-browser-extension://) do no have a sender URL.
         url: rawSender.url ? new URL(rawSender.url) : null,
         get parent()
         {
           let frames = framesOfTabs.get(rawSender.tab.id);
 
           if (!frames)
             return null;
 
-          let frame = frames.get(rawSender.frameId);
+          let frame;
+          // In Microsoft Edge (version 42.17134.1.0) we don't have frameId
+          // so we fall back to iterating over the tab's frames
+          // see https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/11716733
+          if (rawSender.frameId != undefined)
+            frame = frames.get(rawSender.frameId);
+          else if (rawSender.url)
+          {
+            let rawSenderHref = rawSender.url.replace(/#.*/, "");
+
+            for (let [frameId, frameInfo] of frames)
+            {
+              let frameInfoHref = frameInfo.url.href.replace(/#.*/, "");
+
+              // If we have two frames with the same URL
+              // we are going to pick the first one we find
+              // as we have no other way of distinguishing between them.
+              if (frameInfoHref == rawSenderHref)
+              {
+                frame = frameInfo;
+                this.id = frameId;
+                break;
+              }
+            }
+          }
+
           if (frame)
             return frame.parent || null;
-
           return frames.get(0) || null;
         }
       };
     }
 
     return ext.onMessage._dispatch(
       message, sender, sendResponse
     ).includes(true);
   });
 }