--- a/toolkit/components/extensions/test/mochitest/test_chrome_ext_shutdown_cleanup.html
+++ b/toolkit/components/extensions/test/mochitest/test_chrome_ext_shutdown_cleanup.html
@@ -45,15 +45,13 @@ add_task(function* testShutdownCleanup()
      "GlobalManager has been initialized once an extension is started");
   is(UninstallObserver.initialized, true,
      "UninstallObserver has been initialized once an extension is started");
 
   yield extension.unload();
 
   is(GlobalManager.initialized, false,
      "GlobalManager has been uninitialized once all the webextensions have been stopped");
-  is(UninstallObserver.initialized, false,
-     "UninstallObserver has been uninitialized once all the webextensions have been stopped");
 });
 </script>
 
 </body>
 </html>