You appear to be using a very old Firefox 47 version according to the user agent in the System Details list. * User Agent: Mozilla/5.0 (Windows NT 5.1; rv:47.0) Gecko/20100101 Firefox/47.0 Any specific reason for using this outdated Firefox version and not the latest version for your platform (XP: 52.7.3 ESR)? Users on Windows XP and Vista have been moved to the Firefox ESR version. *https://blog.mozilla.org/futurereleases/2017/10/04/firefox-support-for-windows-xp-and-vista/ *https://support.mozilla.org/en-US/kb/get-latest-version-firefox-windows-xp-vista