diff --git a/assets/checksums.txt b/assets/checksums.txt
index 164042097..c7271755c 100644
--- a/assets/checksums.txt
+++ b/assets/checksums.txt
@@ -5,7 +5,7 @@ a1bbb634b15518cb2916bfdc78fd4344 assets/ublock/unbreak.txt
 146704ad1c0393e342afdb416762c183 assets/ublock/badware.txt
 5baa90e2da7cd6a73edff2010557ee57 assets/ublock/redirect.txt
 a2c0edc2da6a2ba591d83f9a105a8401 assets/ublock/experimental.txt
-0a8d548c42652b0303ab35d4e4fe0852 assets/ublock/resources.txt
+4d7a4dae5294ea40b0af1bd184806308 assets/ublock/resources.txt
 fd3bf1065012191e032f81468de43e09 assets/ublock/filter-lists.json
 3605c73f21abca428c7eb69a8bc32dfe assets/thirdparties/easylist-downloads.adblockplus.org/easyprivacy.txt
 a91af77c47c302c0741c7445b0fada1a assets/thirdparties/easylist-downloads.adblockplus.org/easylist.txt
diff --git a/assets/ublock/resources.txt b/assets/ublock/resources.txt
index 751546633..851bfd91c 100644
--- a/assets/ublock/resources.txt
+++ b/assets/ublock/resources.txt
@@ -527,6 +527,7 @@ openload-defuser.js application/javascript
 	var noopfn = function() {
 		;
 	};
+	var excludes = ['177'];
 	var wjdmpGet = function() {
 		return wjdmp;
 	};
@@ -535,8 +536,12 @@ openload-defuser.js application/javascript
 			if ( r.length === 1 && r[0] === 4 ) {
 				for ( var k in o ) {
 					if ( o.hasOwnProperty(k) && typeof o[k] === 'function' ) {
-						o[k] = noopfn;
+						continue;
 					}
+					if ( excludes.indexOf(k) !== -1 ) {
+						continue;
+					}
+					o[k] = noopfn;
 				}
 			}
 			a(r, o);
@@ -593,44 +598,25 @@ widgets.outbrain.com/outbrain.js application/javascript
 		;
 	};
 	var obr = {};
+	var methods = [
+		'callClick', 'callLoadMore', 'callRecs', 'callUserZapping',
+		'callWhatIs', 'cancelRecommendation', 'cancelRecs', 'closeCard',
+		'closeModal', 'closeTbx', 'errorInjectionHandler', 'getCountOfRecs',
+		'getStat', 'imageError', 'manualVideoClicked', 'onOdbReturn',
+		'onVideoClick', 'pagerLoad', 'recClicked', 'refreshSpecificWidget',
+		'refreshWidget', 'reloadWidget', 'researchWidget', 'returnedError',
+		'returnedHtmlData', 'returnedIrdData', 'returnedJsonData', 'scrollLoad',
+		'showDescription', 'showRecInIframe', 'userZappingMessage', 'zappingFormAction'
+	];
 	obr.extern = {
-		callClick: noopfn,
-		callLoadMore: noopfn,
-		callRecs: noopfn,
-		callUserZapping: noopfn,
-		callWhatIs: noopfn,
-		cancelRecommendation: noopfn,
-		cancelRecs: noopfn,
-		closeCard: noopfn,
-		closeModal: noopfn,
-		closeTbx: noopfn,
-		errorInjectionHandler: noopfn,
-		getCountOfRecs: noopfn,
-		getStat: noopfn,
-		imageError: noopfn,
-		manualVideoClicked: noopfn,
-		onOdbReturn: noopfn,
-		onVideoClick: noopfn,
-		pagerLoad: noopfn,
-		recClicked: noopfn,
-		refreshSpecificWidget: noopfn,
-		refreshWidget: noopfn,
-		reloadWidget: noopfn,
-		researchWidget: noopfn,
-		returnedError: noopfn,
-		returnedHtmlData: noopfn,
-		returnedIrdData: noopfn,
-		returnedJsonData: noopfn,
-		scrollLoad: noopfn,
-		showDescription: noopfn,
-		showRecInIframe: noopfn,
-		userZappingMessage: noopfn,
 		video: {
 			getVideoRecs: noopfn,
 			videoClicked: noopfn
-		},
-		zappingFormAction: noopfn
+		}
 	};
+	methods.forEach(function(a) {
+		obr.extern[a] = noopfn;
+	});
 	window.OBR = window.OBR || obr;
 })();
 
diff --git a/platform/chromium/vapi-client.js b/platform/chromium/vapi-client.js
index 6fdc851fc..f7ff589e1 100644
--- a/platform/chromium/vapi-client.js
+++ b/platform/chromium/vapi-client.js
@@ -317,17 +317,6 @@ MessagingChannel.prototype.sendToListeners = function(msg) {
 
 /******************************************************************************/
 
-// No need to have vAPI client linger around after shutdown if
-// we are not a top window (because element picker can still
-// be injected in top window).
-if ( window !== window.top ) {
-    vAPI.shutdown.add(function() {
-        vAPI = null;
-    });
-}
-
-/******************************************************************************/
-
 })(this);
 
 /******************************************************************************/
diff --git a/src/js/contentscript-end.js b/src/js/contentscript-end.js
index 857c97696..fe0b5073f 100644
--- a/src/js/contentscript-end.js
+++ b/src/js/contentscript-end.js
@@ -73,11 +73,10 @@ var uBlockCollapser = (function() {
     var timer = null;
     var requestId = 1;
     var newRequests = [];
-    var pendingRequests = {};
+    var pendingRequests = Object.create(null);
     var pendingRequestCount = 0;
     var src1stProps = {
         'embed': 'src',
-        'iframe': 'src',
         'img': 'src',
         'object': 'data'
     };
@@ -119,10 +118,10 @@ var uBlockCollapser = (function() {
         var request, entry, target, value;
         while ( i-- ) {
             request = requests[i];
-            if ( pendingRequests.hasOwnProperty(request.id) === false ) {
+            entry = pendingRequests[request.id];
+            if ( entry === undefined ) {
                 continue;
             }
-            entry = pendingRequests[request.id];
             delete pendingRequests[request.id];
             pendingRequestCount -= 1;
 
@@ -154,7 +153,7 @@ var uBlockCollapser = (function() {
         // Renew map: I believe that even if all properties are deleted, an
         // object will still use more memory than a brand new one.
         if ( pendingRequestCount === 0 ) {
-            pendingRequests = {};
+            pendingRequests = Object.create(null);
         }
     };
 
@@ -210,6 +209,13 @@ var uBlockCollapser = (function() {
         newRequests.push(new BouncingRequest(req.id, tagName, src));
     };
 
+    var addMany = function(targets) {
+        var i = targets.length;
+        while ( i-- ) {
+            add(targets[i]);
+        }
+    };
+
     var iframeSourceModified = function(mutations) {
         var i = mutations.length;
         while ( i-- ) {
@@ -254,21 +260,26 @@ var uBlockCollapser = (function() {
         newRequests.push(new BouncingRequest(req.id, 'iframe', src));
     };
 
-    var iframesFromNode = function(node) {
-        if ( node.localName === 'iframe' ) {
-            addIFrame(node);
-        }
-        var iframes = node.getElementsByTagName('iframe');
+    var addIFrames = function(iframes) {
         var i = iframes.length;
         while ( i-- ) {
             addIFrame(iframes[i]);
         }
+    };
+
+    var iframesFromNode = function(node) {
+        if ( node.localName === 'iframe' ) {
+            addIFrame(node);
+        }
+        addIFrames(node.getElementsByTagName('iframe'));
         process();
     };
 
     return {
         add: add,
+        addMany: addMany,
         addIFrame: addIFrame,
+        addIFrames: addIFrames,
         iframesFromNode: iframesFromNode,
         process: process
     };
@@ -925,35 +936,17 @@ var uBlockCollapser = (function() {
 
 (function() {
     var collapser = uBlockCollapser;
-    var elems, i, elem;
-
-    elems = document.getElementsByTagName('embed');
-    i = elems.length;
-    while ( i-- ) {
-        collapser.add(elems[i]);
-    }
-
-    elems = document.getElementsByTagName('object');
-    i = elems.length;
-    while ( i-- ) {
-        collapser.add(elems[i]);
-    }
-
-    elems = document.getElementsByTagName('img');
-    i = elems.length;
+    var elems = document.getElementsByTagName('img'),
+        i = elems.length, elem;
     while ( i-- ) {
         elem = elems[i];
         if ( elem.complete ) {
             collapser.add(elem);
         }
     }
-
-    elems = document.getElementsByTagName('iframe');
-    i = elems.length;
-    while ( i-- ) {
-        collapser.addIFrame(elems[i]);
-    }
-
+    collapser.addMany(document.getElementsByTagName('embed'));
+    collapser.addMany(document.getElementsByTagName('object'));
+    collapser.addIFrames(document.getElementsByTagName('iframe'));
     collapser.process(0);
 })();