Percy,
It's not been mention but the new update because you said custom may have created a new profile for you. Thus everything lost. If that's the case you may be OK. Take a look in, someone may need to help with the path as I've been in Linux too long, C:/ documents & settings/"what ever user you are/application data/mozilla/"your old profile". You can then copy and paste the total contents of the old profile into the folder of the new profile.
BTW in order to see all the application data you need to allow viewing of hidden files & folders.
I may also have the path a little off.
You also can try this if it hasn't changed. Firefox has a hidden profile manager. Give it a shot and see if 2 profiles show up.
Windows 98, ME, 2000, and XP

1. Exit Firefox. To close Firefox, at the top of the Firefox window, select the File menu, and then select Exit.
2. Select the START menu in the Windows Taskbar. Then, select Run.
3. In the Run dialog, enter the following:


firefox.exe -ProfileManager

4. Click OK.

MAKE SURE YOU GET THE SYNTAX CORRECT

John
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