Changes following review

platform/firefox/vapi-background.js

@@ -295,11 +295,9 @@ var windowWatcher = {
         if ( tabBrowser.deck ) {
             // Fennec
             tabContainer = tabBrowser.deck;
-            tabContainer.addEventListener('DOMTitleChanged', tabWatcher.onFennecLocationChange);
         } else if ( tabBrowser.tabContainer ) {
             // desktop Firefox
             tabContainer = tabBrowser.tabContainer;
-            tabBrowser.addTabsProgressListener(tabWatcher);
             vAPI.contextMenu.register(this.document);
         } else {
             return;
@@ -321,8 +319,6 @@ var windowWatcher = {
 /******************************************************************************/
 
 var tabWatcher = {
-    SAME_DOCUMENT: Ci.nsIWebProgressListener.LOCATION_CHANGE_SAME_DOCUMENT,
-
     onTabClose: function({target}) {
         // target is tab in Firefox, browser in Fennec
         var tabId = vAPI.tabs.getTabId(target);
@@ -331,69 +327,9 @@ var tabWatcher = {
     },
 
     onTabSelect: function({target}) {
-        // target is tab in Firefox, browser in Fennec
-        var browser = (target.linkedBrowser || target);
-        var URI = browser.currentURI;
-        var aboutPath = URI.schemeIs('about') && URI.path;
-        var tabId = vAPI.tabs.getTabId(target);
-
-        if ( !aboutPath || (aboutPath !== 'blank' && aboutPath !== 'newtab') ) {
-            vAPI.setIcon(tabId, getOwnerWindow(target));
-            return;
-        }
-
-        if ( browser.webNavigation.busyFlags === 0 || /*BUSY_FLAGS_NONE*/ 
-             browser.webNavigation.busyFlags === undefined) {
-            vAPI.tabs.onNavigation({
-                frameId: 0,
-                tabId: tabId,
-                url: URI.asciiSpec
-            });
-        }
-    },
-
-    onLocationChange: function(browser, webProgress, request, location, flags) {
-        if ( !webProgress.isTopLevel ) {
-            return;
-        }
-
-        var tabId = vAPI.tabs.getTabId(browser);
-
-        // LOCATION_CHANGE_SAME_DOCUMENT = "did not load a new document"
-        if ( flags & this.SAME_DOCUMENT ) {
-            vAPI.tabs.onUpdated(tabId, {url: location.asciiSpec}, {
-                frameId: 0,
-                tabId: tabId,
-                url: browser.currentURI.asciiSpec
-            });
-            return;
-        }
-
-        // https://github.com/gorhill/uBlock/issues/105
-        // Allow any kind of pages
-        vAPI.tabs.onNavigation({
-            frameId: 0,
-            tabId: tabId,
-            url: location.asciiSpec
-        });
+        vAPI.setIcon(vAPI.tabs.getTabId(target), getOwnerWindow(target));
+        return;
     },
-
-    onFennecLocationChange: function({target: doc}) {
-        // Fennec "equivalent" to onLocationChange
-        // note that DOMTitleChanged is selected as it fires very early
-        // (before DOMContentLoaded), and it does fire even if there is no title
-        var win = doc.defaultView;
-        if ( win !== win.top ) {
-            return;
-        }
-
-        vAPI.tabs.onNavigation({
-            frameId: 0,
-            tabId: vAPI.tabs.getTabId(getOwnerWindow(win).BrowserApp.getTabForWindow(win)),
-            url: Services.io.newURI(win.location.href, null, null).asciiSpec
-        });
-    }
-
 };
 
 /******************************************************************************/
@@ -445,7 +381,6 @@ vAPI.tabs = {};
 /******************************************************************************/
 
 vAPI.tabs.registerListeners = function() {
-    // onNavigation and onUpdated handled with tabWatcher.onLocationChange
     // onClosed - handled in tabWatcher.onTabClose
     // onPopup - handled in httpObserver.handlePopup
 
@@ -471,7 +406,6 @@ vAPI.tabs.registerListeners = function() {
             if ( tabBrowser.deck ) {
                 // Fennec
                 tabContainer = tabBrowser.deck;
-                tabContainer.removeEventListener('DOMTitleChanged', tabWatcher.onFennecLocationChange);
             } else if ( tabBrowser.tabContainer ) {
                 tabContainer = tabBrowser.tabContainer;
                 tabBrowser.removeTabsProgressListener(tabWatcher);
@@ -1265,14 +1199,6 @@ var httpObserver = {
             return;
         }
 
-        if ( vAPI.fennec && lastRequest.type === this.MAIN_FRAME ) {
-            vAPI.tabs.onNavigation({
-                frameId: 0,
-                tabId: lastRequest.tabId,
-                url: URI.asciiSpec
-            });
-        }
-
         // If request is not handled we may use the data in on-modify-request
         if ( channel instanceof Ci.nsIWritablePropertyBag ) {
             channel.setProperty(this.REQDATAKEY, [
@@ -1397,6 +1323,38 @@ vAPI.net.registerListeners = function() {
         shouldLoadListener
     );
 
+    var locationChangedListenerMessageName = location.host + ':locationChanged';
+    var locationChangedListener = function(e) {
+        var details = e.data;
+        var browser = e.target;
+        var tabId = vAPI.tabs.getTabId(browser);
+        
+        //console.debug("nsIWebProgressListener: onLocationChange: " + details.url + " (" + details.flags + ")");        
+
+        // LOCATION_CHANGE_SAME_DOCUMENT = "did not load a new document"
+        if ( details.flags & Ci.nsIWebProgressListener.LOCATION_CHANGE_SAME_DOCUMENT ) {
+            vAPI.tabs.onUpdated(tabId, {url: details.url}, {
+                frameId: 0,
+                tabId: tabId,
+                url: browser.currentURI.asciiSpec
+            });
+            return;
+        }
+
+        // https://github.com/gorhill/uBlock/issues/105
+        // Allow any kind of pages
+        vAPI.tabs.onNavigation({
+            frameId: 0,
+            tabId: tabId,
+            url: details.url,
+        });
+    }
+
+    vAPI.messaging.globalMessageManager.addMessageListener(
+        locationChangedListenerMessageName,
+        locationChangedListener
+    );
+
     httpObserver.register();
 
     cleanupTasks.push(function() {
@@ -1405,6 +1363,11 @@ vAPI.net.registerListeners = function() {
             shouldLoadListener
         );
 
+        vAPI.messaging.globalMessageManager.removeMessageListener(
+            locationChangedListenerMessageName,
+            locationChangedListener
+        );
+
         httpObserver.unregister();
     });
 };