I am not sure of the problem but I would start all over with a clean install of Firefox. I know you have done this but try my method.
First download the latest fresh v.126.96.36.199 of Firefox from Mozilla Firefox and save to disk. Then uninstall 1.5 that you now have. Then clean out all references to Firefox in the program files and in the registry... be careful in the registry if you are not comfortable there.
Next install the fresh download of the latest version of Firefox. I hope this works for you... it has for me under similar circumstances.
Best of luck,
Just 3 days ago I cannot get into Mozilla-Firefox 1.5 at
all . It just responded Firefox is offline . However if
I can use Internet Explorer 6 it's ok and I can get
into Yahoo mails , gmails,..etc.
I also tried to clean my registry and old files/folders
using CClean and Norton Cleanup and Window Clean..
still no improvement.
I tried uninstall and re-install Mozilla Firefox 1.5
and still same problem exist.
Can any one suggest on how I can get use Mozilla FireFox.
I am on Window XP Pro with ZoneAlarm FireWall (basic )
and using Norton Systemworks , AVG , Ewido Anti Malware,
Spybot Search and Destroy.