Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

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 updated Firefox to 4.0 and now I keep getting a box that says its a JavaScript Application and inside the box it says "Uninstal Set". What do i do???

more options

I keep getting more and more of them at a time and its annoying me! Everytime I try to open a page in firefox or do anything this happens.

I keep getting more and more of them at a time and its annoying me! Everytime I try to open a page in firefox or do anything this happens.

All Replies (1)

more options

Someone else posted this issue recently. Do the suggestions in this thread help?

when open firefox or change website, there is a warning window, [JavaScript Application, "uninstal set" | Firefox Support Forum | Firefox Help]