If you are running Ubuntu, as every good person should, Firefox-3.5 is not in the official repositories yet. But do not despair! You can add the PPA Ubuntu Mozilla Security repository to your system and download FF35 immediately.
For full details, see here: https://launchpad.net/~ubuntu-mozilla-security/+archive/ppa
For the quick 6-step process, do the following:
(All from command line.)
- sudo echo "deb http://ppa.launchpad.net/ubuntu-mozilla-security/ppa/ubuntu jaunty main" | sudo tee -a /etc/apt/sources.list
- gpg --keyserver keyserver.ubuntu.com --recv-keys B9F1C432AE74AE63
- gpg --armor --export B9F1C432AE74AE63 | sudo apt-key add -
- sudo apt-get update
- sudo apt-get install firefox-3.5
- firefox-3.5 & # Or just start firefox-3.5 from the Run Dialog
I probably will be running some speed tests here soon, and if I do, I will post the resulting comparison between the two browser versions.