Cannot roll back to Firefox 4 after installing Firefox 12
I'd upgraded to Firefox 12 from Firefox 4 on my Windows XP system, and it consistently closes instantly when starting, no crash dialog, no errors, nothing. Just instant close. I've tried opening it in safe mode, disabling all add-ons, and restarting in normal mode, and it still closes instantly.
So I decided to go back to Firefox 4. I uninstalled 12, manually deleted all the Mozilla Firefox folders and data, rebooted the computer, and installed Firefox 4. When I start Firefox 4 it will, without permission, immediately download the Firefox 12 upgrade. I tried unchecking the 'Check for updates to the browser' checkbox, but since it's already in the process of downloading the upgrade, I can't stop it.
What do I have to do to get rid of all vestiges of Firefox 12 so i can go back to using Firefox 4 normally, short of completely reinstalling my OS?
Earlier Firefox versions 3.x, 4.0.x, etc. are no longer maintained with Security and Stability updates and therefore contain Security Vulnerabilities that are known and could be exploited by some websites to gain unauthorized access to information or to disrupt critical processing. Only the Latest version Firefox 12.0 is secure against these known vulnerabilities. See these articles for some guidance:
由 Hasan 於 修改
You could try the Firefox Beta (13) or if it doesnt work either, Firefox Aurora (14)