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.

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

I'm getting a persistent "JavaScript Application" popup notice that is difficult to close. The problem just started today, and I can't seem to fix it. Any suggestions?

more options

The offending popup reads:

[JavaScript Application]

(yellow triangle with an exclamation point) followed by the words "uninstal set"

Note: the spelling of uninstall is as shown above.

The offending popup reads: [JavaScript Application] (yellow triangle with an exclamation point) followed by the words "uninstal set" Note: the spelling of uninstall is as shown above.

All Replies (1)

more options

Other users have reported that this is caused by one of their add-ons. I suggest going to the Add-ons page and disabling everything in the Extensions category that is not essential, and then restarting Firefox. Hopefully it's not caused by something you really rely on.

orange Firefox button > Add-ons > Extensions

or

Tools menu > Add-ons > Extensions

Any luck?