The upgrade to Hardy gives you FF3 beta. I like it, but many of my add-ons didn’t worked. So, I purged FF3:
> sudo apt-get purge firefox
Of course, this doesn’t really purge firefox. I had to delete my profile:
> cd /home/me/
> sudo rm -r ./.mozilla
The I installed FF2:
> sudo apt-get intstall firefox-2
Now everything works except my colorzilla add-on. My first attempt to fix colorzilla was to add some libraries:
> apt-get install libxul-dev libstdc++5 gcc-4.1 libstdc++6
This didn’t work for me, so I’m off to find another solution.