Firefox is now closing unexpectedly shortly after I open it. There is not even enough time to click on help, then disable ad-ons. I also don't receive any error messages. It just closes after a few seconds. Help! Don't want to use other browsers.

I came here to post because it seems my question wasn't posting when simply clicking on "ask this question".

I think in the circumstances, an uninstall/reinstall is called for. Please follow these instructions.
Go to [http://www.mozilla.com/en-US/firefox/fx/?ref=logo Download Firefox 4.0] and download a fresh installation file using IE8 or 9 and choose to save it to your desktop when you see the prompt.
Then go to Add/Remove Programs, scroll down to '''Mozilla Firefox '''and remove it, choosing to keep your bookmarks, customizations etc., (don't checkmark the box).
Then reboot and delete the folder called '''Mozilla Firefox '''at this location: ''C:\Program Files\Mozilla Firefox''
Finally run the installation file you downloaded to the desktop earlier.
Your bookmarks, customizations etc., are maintained in a different location and will become available to you again once you complete the installation.

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