Posted 23 June 2010 - 02:41 PM
Go to firefox help troubleshooting information
click "open containing folder" button
open extensions.ini in that folder in, say, notepad
isolate all listing which start with this "Extension[your number may vary]=C:\Documents and Settings\[your user name]\Local Settings\Application Data\ [here are your likely culprits]"
I only had one such listing.
I just removed the offending line, saved the changed extensions.ini, rebooted ff, and voila! All gone.
Might be a good idea to rename the old extensions.ini to oldextensions.ini before you test to see what works.