--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -205,28 +205,24 @@ XPCOMUtils.defineLazyGetter(this, "Win7F
       }
     };
   }
   return null;
 });
 
 const nsIWebNavigation = Ci.nsIWebNavigation;
 
-var gLastBrowserCharset = null;
 var gLastValidURLStr = "";
 var gInPrintPreviewMode = false;
 var gContextMenu = null; // nsContextMenu instance
 var gMultiProcessBrowser =
   window.QueryInterface(Ci.nsIInterfaceRequestor)
         .getInterface(Ci.nsIWebNavigation)
         .QueryInterface(Ci.nsILoadContext)
         .useRemoteTabs;
-var gAppInfo = Cc["@mozilla.org/xre/app-info;1"]
-                  .getService(Ci.nsIXULAppInfo)
-                  .QueryInterface(Ci.nsIXULRuntime);
 
 if (AppConstants.platform != "macosx") {
   var gEditUIVisible = true;
 }
 
 /* globals gBrowser, gNavToolbox, gURLBar:true, gNavigatorBundle*/
 [
   ["gBrowser",            "content"],