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

How do i get "unistall set" for Java Script Application to stop popping up on my screen every sec? I can't do anything

  • 1 reply
  • 59 have this problem
  • 1 view
  • Last reply by cor-el

more options

As soon as I log onto Firefox a box title JavaScript Application keeps popping up and it says unistall set. When I close it it pops up multiple times back to back. Stopping me from browsing.

As soon as I log onto Firefox a box title JavaScript Application keeps popping up and it says unistall set. When I close it it pops up multiple times back to back. Stopping me from browsing.

All Replies (1)

more options

This issue can be caused by an extension that isn't working properly.

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Appearance/Themes).


In Firefox 4 you can use one of these to start in Safe mode:

  • Help > Restart with Add-ons Disabled
  • Hold down the Shift key while double clicking the Firefox desktop shortcut (Windows)