Issue 6010 - Ignore requests initiated by the browser or extensions

ext/background.js

Index: ext/background.js
===================================================================
--- a/ext/background.js
+++ b/ext/background.js
@@ -583,16 +583,28 @@
     // ws:// and wss://) with the url patterns, given below, when adding this
     // listener. But unfortunately, Chrome <=57 doesn't support the WebSocket
     // protocol and is causing an error if it is given.
     let url = new URL(details.url);
     if (url.protocol != "http:" && url.protocol != "https:" &&
         url.protocol != "ws:" && url.protocol != "wss:")
       return;
 
+    if (details.originUrl)
+    {
+      // Firefox-only currently, ignore requests initiated by the browser and
+      // extensions.
+      let originUrl = new URL(details.originUrl);
+      if (originUrl.protocol == "chrome:" ||
+          originUrl.protocol == "moz-extension:")
+      {
+        return;
+      }
+    }
+
     // We are looking for the frame that contains the element which
     // has triggered this request. For most requests (e.g. images) we
     // can just use the request's frame ID, but for subdocument requests
     // (e.g. iframes) we must instead use the request's parent frame ID.
     let {frameId, type} = details;
     if (type == "sub_frame")
       frameId = details.parentFrameId;