--- a/browser/components/shell/test/browser.ini
+++ b/browser/components/shell/test/browser.ini
@@ -1,5 +1,6 @@
 [DEFAULT]
+skip-if = os != "linux"
 
 [browser_420786.js]
 [browser_633221.js]
-skip-if = os != "linux"
+

--- a/browser/components/shell/test/browser_420786.js
+++ b/browser/components/shell/test/browser_420786.js
@@ -67,20 +67,16 @@ function onPageLoad() {
 
   gBrowser.removeCurrentTab();
   finish();
 }
 
 function test() {
   var osString = Cc["@mozilla.org/xre/app-info;1"].
                  getService(Ci.nsIXULRuntime).OS;
-  if (osString != "Linux") {
-    todo(false, "This test is Linux specific for now.");
-    return;
-  }
 
   try {
     // If GSettings is available, then the GConf tests
     // will fail
     var gsettings = Cc["@mozilla.org/gsettings-service;1"].
                     getService(Ci.nsIGSettingsService).
                     getCollectionForSchema("org.gnome.desktop.background");
     todo(false, "This test doesn't work when GSettings is available");