Additional System Details
- Shockwave Flash 27.0 r0
- User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0
Use this link and reinstall the browser; http://www.mozilla.org/en-US/firefox/all/
Thank you very much. I did as you suggested but still got the error. I uninstalled Firefox completely then reinstalled it and the problem has solved itself. Thank you for your kind help!