Issue 5315 - Add support for Microsoft Edge

lib/requestBlocker.js

Index: lib/requestBlocker.js
===================================================================
--- a/lib/requestBlocker.js
+++ b/lib/requestBlocker.js
@@ -30,8 +30,11 @@
 const devtools = require("devtools");
 
 // Chrome can't distinguish between OBJECT_SUBREQUEST and OBJECT requests.
-if (!("OBJECT_SUBREQUEST" in chrome.webRequest.ResourceType))
+if (!chrome.webRequest.ResourceType ||
+    !("OBJECT_SUBREQUEST" in chrome.webRequest.ResourceType))
+{
   RegExpFilter.typeMap.OBJECT_SUBREQUEST = RegExpFilter.typeMap.OBJECT;
+}
 
 // Map of content types reported by the browser to the respecitve content types
 // used by Adblock Plus. Other content types are simply mapped to OTHER.
@@ -186,8 +189,13 @@
   // Chrome 58 onwards directly supports WebSocket blocking, so we can ignore
   // messages from the wrapper here (see https://crbug.com/129353). Hopefully
   // WebRTC will be supported soon too (see https://crbug.com/707683).
-  if (msg.requestType.toUpperCase() in chrome.webRequest.ResourceType)
+  // Edge supports neither webRequest.ResourceType nor WebSocket blocking yet:
+  // https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/10297376/
+  if (chrome.webRequest.ResourceType &&
+      (msg.requestType.toUpperCase() in chrome.webRequest.ResourceType))
+  {
     return false;
+  }
 
   return ext.webRequest.onBeforeRequest._dispatch(
      new URL(msg.url),