I have a couple Firefox profiles on my account. In the past Googletalk worked on both but recently when I tried to use Googletalk on my main Firefox profile in prompted to install Googletalk. I reinstall it but it still isn't recognized on one Firefox profile, in work fine on the other profile.

I tried uninstalling and re-installing; disabling the working profile and installing; disabling privacy plugins like Ghostery, Adblock, BetterPrivacy. Nothing has worked.

Any ideas on how to resolve this?

System info:
lsb_release -ds: Ubuntu 12.04.2 LTS (Xubuntu actually)
firefox --version: Mozilla Firefox 20.0
uname -rvm: 3.2.0-41-generic #66-Ubuntu SMP Thu Apr 25 03:28:09 UTC 2013 i686