this is really GREAT addon. i've use it since ff2 and really help me a lot.
when i upgraded to ff 3.0.6, i see the same problem. then i try to install it on brand new clean profile.
from there i can see that there is conflict between ff2 and ff3 profiles.
- backup your whole profile folder to somewhere else
- using mozbackup, backup your profile. i only use it to backup my passwords. or for passwords files copy key3.db, signons2.txt, signons3.txt, signons(number).txt
- delete all files (just files not folder) in root folder of your profile.
- restore passowrd files or your profile from mozbackup