Well, personally I don't have any issues with this version. So just some suggestions.
1. In the future, save (and backup) the downloaded version of a newly installed program. That way, you can always go back to it. With all the automatic updates going on, download the installer of a working version and save that.
2. Delete the Firefox profile to see if maybe that is corrupted. in XP it would be in C:\Documents and Settings\<your username>\Application Data\Mozilla\Firefox\Profiles.
3. Go forward to 3.0.11 from www.mozilla.com and see if that works with you.
4. Uninstall (and delete the profile). Then reinstall any old version you like from http://www.filehippo.com/download_firefox/5531/ (column at right). I assume they do have the English version, not all 60 other languages.
Please tell what worked.
I'm having to use clunky old IE 7 because Firefox, which I've heretofore been using with no problem, updated to 3.0.10 and now I can't even get it to load. It will load the Google page but my hard drive will churn and churn and if I click on the title bar "program not responding" will be added, altho I can X out of the program and the "this program has quit responding" box will pop up on the desktop (Also it wants to send an error msg to MS). I've read the other FF3.0.10 threads but those don't sound like what I'm experiencing. I'm using WinXP Sp3 on a 1.81 Ghz machine with 1GB of ram. Help?