This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Əgər kömək lazımdırsa lütfən yeni sual verin.

recieving java script error messages

millsjab
millsjab
more options

Every time I open Firefox, I get a JavaScript Application error message that says; Error: TypeError; CSSAndUICompatability_avg.ShowUIElementsByFilter is not a function

Every time I open Firefox, I get a JavaScript Application error message that says; Error: TypeError; CSSAndUICompatability_avg.ShowUIElementsByFilter is not a function

All Replies (1)

Michael Verdi
Michael Verdi
more options

That could be due to Malware. Check the Troubleshoot Firefox issues caused by malware article. You should probably download and run both Malwarebytes and SUPERAntiSpyware.