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

ext/background.js

Index: ext/background.js
diff --git a/ext/background.js b/ext/background.js
index e0242e545396f8e48fdbbfea961b8cf42e14a8b9..3b43ec49af55f15be2e6bb7c46f6c5b55335dcec 100644
--- a/ext/background.js
+++ b/ext/background.js
@@ -559,10 +559,34 @@
           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;
         }
       };