After downloading Firefox 4 (for Windows XP), I started getting a popup box on every page I go to that says "[JavaScript Application] uninstal set", and I don't know how to get rid of it.

I downloaded FireFox 4 today, and as soon as the download was finished, I launched the browser. As soon as I did, I got a message box that has "[JavaScript Application]" at the top and "uninstal set" as the message. This is the exact wording in the box, including the misspelling. I thought this might be an indication that my version of JavaScript was out of date, so I went to Java's website to update it. However, after downloading the latest version, the message box continued to appear. Has anyone else had this problem, and, if so, is there a way to fix it?

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 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?

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