I installed Firefox 4. Now, every time I open Firefox, a prompt pops up asking if I want to install the Firefox file.

I tried reinstalling Firefox 4 and rebooting. But the same thing happened. I deleted the Firefox icon from desktop, then re-sent it to desktop, to no avail.
It's like the set-up icon has replaced the regular icon on my desktop.

Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Appearance/Themes).
* Don't make any changes on the Safe mode start window.
See:
* [[Troubleshooting extensions and themes]]

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