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Firefox screensaver popup on my desktop after closing Firefox. Help!

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I have Firefox 3.6.11. Nearly every time I close Firefox, a Firefox screensaver pop-up appears on my Desktop. I want it gone.

I have Firefox 3.6.11. Nearly every time I close Firefox, a Firefox screensaver pop-up appears on my Desktop. I want it gone.

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That isn't a standard Firefox feature, something you installed has added that to Firefox.

Do you have that problem when running in the Firefox SafeMode?
http://support.mozilla.com/en-US/kb/Safe+Mode
Don't select anything right now, just use "Continue in SafeMode."

If not, see this:
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+theme...