From 09354ce7e2ea471f9633a9d722f2b2a860ad3db9 Mon Sep 17 00:00:00 2001
From: gorhill <rhill@raymondhill.net>
Date: Fri, 1 May 2015 19:11:36 -0400
Subject: [PATCH] this fixes https://github.com/gorhill/uBlock/issues/162

---
 src/js/contentscript-end.js | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/src/js/contentscript-end.js b/src/js/contentscript-end.js
index db1af9cb8..127d76bd1 100644
--- a/src/js/contentscript-end.js
+++ b/src/js/contentscript-end.js
@@ -246,9 +246,27 @@ var uBlockCollapser = (function() {
         newRequests.push(new BouncingRequest(req.id, tagName, src));
     };
 
-    var addIFrame = function(iframe) {
+    var iframeSourceModified = function(mutations) {
+        var i = mutations.length;
+        while ( i-- ) {
+            addIFrame(mutations[i].target, true);
+        }
+        process();
+    };
+    var iframeSourceObserver = new MutationObserver(iframeSourceModified);
+    var iframeSourceObserverOptions = {
+        attributes: true,
+        attributeFilter: [ 'src' ]
+    };
+
+    var addIFrame = function(iframe, dontObserve) {
+        // https://github.com/gorhill/uBlock/issues/162
+        // Be prepared to deal with possible change of src attribute.
+        if ( dontObserve !== true ) {
+            iframeSourceObserver.observe(iframe, iframeSourceObserverOptions);
+        }
+
         var src = iframe.src;
-        // TODO: niject content script in `about:blank` as well.
         if ( src === '' || typeof src !== 'string' ) {
             return;
         }