I’m posting using the recent version of firefox, 3.5! It’s a RC but it works well, very well! I was really impressed with the overall performance. So, for those who want to use firefox 3.5 on ubuntu (jaunty) you just have to do the following steps:

1. Add the following repositories to /etc/apt/sources.list
   deb http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu jaunty main
2. sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 247510BE
3. sudo apt-get update && sudo apt-get install firefox-3.5
4. Firefox 3.5 is installed but we still have 3.0 (I maintained it in the system) and so we have to change the default symlink by opening a terminal and doing:
   cd /usr/bin
rm firefox
sudo ln -s firefox-3.5 firefox

There is a minor bug for those of you who use ATI proprietary driver, fglrx, a render problem with pngs. They render with the wrong colors. You have to change a setting on firefox. On the config page, about:config, change the setting gfx.color_management.mode from 2 to 0.