Hi, Please check if this happens in [https://support.mozilla.com/en-US/kb/Safe%20Mode Safe Mode.] [http://kb.mozillazine.org/Problematic_extensions Problematic Extensions] [https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes Troubleshooting Extensions and Themes] [https://www.mozilla.org/en-US/plugincheck/ Plugins Update] [https://support.mozilla.com/en-US/kb/Troubleshooting%20plugins Troubleshooting Plugins] [http://kb.mozillazine.org/Testing_plugins Testing Plugins] [http://support.mozilla.com/en-US/kb/Uninstalling+add-ons Uninstalling Add-ons] [http://support.mozilla.com/en-US/kb/Cannot%20uninstall%20an%20add-on Cannot Uninstall Add-on] [http://kb.mozillazine.org/Uninstalling_toolbars Uninstalling Toolbars]