Issue 3541, issue 3489 - Don't attempt to process chrome:// and resource:// events to avoid trigger…

lib/child/contentPolicy.js

Index: lib/child/contentPolicy.js
===================================================================
--- a/lib/child/contentPolicy.js
+++ b/lib/child/contentPolicy.js
@@ -274,33 +274,38 @@ var PolicyImplementation =
   //
 
   shouldLoad: function(contentType, contentLocation, requestOrigin, node, mimeTypeGuess, extra)
   {
     // Ignore requests without context and top-level documents
     if (!node || contentType == Ci.nsIContentPolicy.TYPE_DOCUMENT)
       return Ci.nsIContentPolicy.ACCEPT;
 
+    // Bail out early for chrome: an resource: URLs, this is a work-around for
+    // https://bugzil.la/1127744 and https://bugzil.la/1247640
+    let location = Utils.unwrapURL(contentLocation);
+    if (location.schemeIs("chrome") || location.schemeIs("resource"))
+      return Ci.nsIContentPolicy.ACCEPT;
+
     // Ignore standalone objects
     if (contentType == Ci.nsIContentPolicy.TYPE_OBJECT && node.ownerDocument && !/^text\/|[+\/]xml$/.test(node.ownerDocument.contentType))
       return Ci.nsIContentPolicy.ACCEPT;
 
     let wnd = Utils.getWindow(node);
     if (!wnd)
       return Ci.nsIContentPolicy.ACCEPT;
 
     // Data loaded by plugins should be associated with the document
     if (contentType == Ci.nsIContentPolicy.TYPE_OBJECT_SUBREQUEST && node instanceof Ci.nsIDOMElement)
       node = node.ownerDocument;
 
     // Fix type for objects misrepresented as frames or images
     if (contentType != Ci.nsIContentPolicy.TYPE_OBJECT && (node instanceof Ci.nsIDOMHTMLObjectElement || node instanceof Ci.nsIDOMHTMLEmbedElement))
       contentType = Ci.nsIContentPolicy.TYPE_OBJECT;
 
-    let location = Utils.unwrapURL(contentLocation);
     let result = shouldAllow(wnd, node, types.get(contentType), location.spec);
     return (result ? Ci.nsIContentPolicy.ACCEPT : Ci.nsIContentPolicy.REJECT_REQUEST);
   },
 
   shouldProcess: function(contentType, contentLocation, requestOrigin, insecNode, mimeType, extra)
   {
     return Ci.nsIContentPolicy.ACCEPT;
   },