We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

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?