diff --git a/platform/firefox/frameModule.js b/platform/firefox/frameModule.js
index a1de19ad9..aab44730b 100644
--- a/platform/firefox/frameModule.js
+++ b/platform/firefox/frameModule.js
@@ -323,7 +323,7 @@ const LocationChangeListener = function(docShell) {
             this.docShell.addProgressListener(this, Ci.nsIWebProgress.NOTIFY_LOCATION);
         }
     }
-}
+};
 
 LocationChangeListener.prototype.QueryInterface = XPCOMUtils.generateQI(["nsIWebProgressListener", "nsISupportsWeakReference"]);
 
diff --git a/platform/firefox/vapi-background.js b/platform/firefox/vapi-background.js
index faaf1a549..58f3d4cc1 100644
--- a/platform/firefox/vapi-background.js
+++ b/platform/firefox/vapi-background.js
@@ -328,7 +328,6 @@ var tabWatcher = {
 
     onTabSelect: function({target}) {
         vAPI.setIcon(vAPI.tabs.getTabId(target), getOwnerWindow(target));
-        return;
     },
 };
 
@@ -408,7 +407,6 @@ vAPI.tabs.registerListeners = function() {
                 tabContainer = tabBrowser.deck;
             } else if ( tabBrowser.tabContainer ) {
                 tabContainer = tabBrowser.tabContainer;
-                tabBrowser.removeTabsProgressListener(tabWatcher);
             }
 
             tabContainer.removeEventListener('TabClose', tabWatcher.onTabClose);
@@ -1348,7 +1346,7 @@ vAPI.net.registerListeners = function() {
             tabId: tabId,
             url: details.url,
         });
-    }
+    };
 
     vAPI.messaging.globalMessageManager.addMessageListener(
         locationChangedListenerMessageName,