diff --git a/src/js/3p-filters.js b/src/js/3p-filters.js
index 8169b9d54..955118ac4 100644
--- a/src/js/3p-filters.js
+++ b/src/js/3p-filters.js
@@ -422,12 +422,8 @@ var buttonApplyHandler = function() {
 
     renderBusyOverlay(true);
 
-    var onReloadDone = function() {
-        messager.send({ what: 'reloadAllFilters' });
-    };
-
     var onSelectionDone = function() {
-        messager.send({ what: 'reloadAllFilters' }, onReloadDone);
+        messager.send({ what: 'reloadAllFilters' });
     };
 
     selectFilterLists(onSelectionDone);
diff --git a/src/js/contentscript-end.js b/src/js/contentscript-end.js
index b997e2ad9..4fd0b2315 100644
--- a/src/js/contentscript-end.js
+++ b/src/js/contentscript-end.js
@@ -255,9 +255,27 @@ 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;
         }
diff --git a/src/js/pagestore.js b/src/js/pagestore.js
index 59b934e03..fc6d8caf0 100644
--- a/src/js/pagestore.js
+++ b/src/js/pagestore.js
@@ -20,7 +20,7 @@
 */
 
 /* jshint bitwise: false */
-/* global vAPI, µBlock */
+/* global µBlock */
 
 /*******************************************************************************
 
@@ -438,7 +438,7 @@ PageStore.prototype.getNetFilteringSwitch = function() {
     // https://github.com/chrisaljoudi/uBlock/issues/1078
     // Use both the raw and normalized URLs.
     this.netFiltering = µb.getNetFilteringSwitch(tabContext.normalURL);
-    if ( this.netFiltering && tabContext.rawURL !== tabContext.pageURL ) {
+    if ( this.netFiltering && tabContext.rawURL !== tabContext.normalURL ) {
         this.netFiltering = µb.getNetFilteringSwitch(tabContext.rawURL);
     }
     this.netFilteringReadTime = Date.now();
diff --git a/src/js/ublock.js b/src/js/ublock.js
index b713df96d..dff9fd966 100644
--- a/src/js/ublock.js
+++ b/src/js/ublock.js
@@ -180,6 +180,12 @@ var matchWhitelistDirective = function(url, hostname, directive) {
     var line, matches, key, directive;
     for ( var i = 0; i < lines.length; i++ ) {
         line = lines[i].trim();
+        // https://github.com/gorhill/uBlock/issues/171
+        // Skip empty lines
+        if ( line === '' ) {
+            continue;
+        }
+
         // Don't throw out commented out lines: user might want to fix them
         if ( line.charAt(0) === '#' ) {
             key = '#';
@@ -208,9 +214,14 @@ var matchWhitelistDirective = function(url, hostname, directive) {
             }
         }
 
+        // https://github.com/gorhill/uBlock/issues/171
+        // Skip empty keys
+        if ( key === '' ) {
+            continue;
+        }
+
         // Be sure this stays fixed:
         // https://github.com/chrisaljoudi/uBlock/issues/185
-
         if ( whitelist.hasOwnProperty(key) === false ) {
             whitelist[key] = [];
         }