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I still recommend using Swiftfox over Firefox, but if you really want to use Firefox, there is a PPA (many people might prefer this over the Mozilla Daily PPA which has daily Firefox builds).

Add the Firefox 4 Ubuntu PPA by using the following command:

sudo add-apt-repository ppa:mozillateam/firefox-stable


Then, install Firefox 4
sudo apt-get update && sudo apt-get install firefox

I see some fixes related to Apparmor and some other changes so if something doesn't work with your current Firefox 3.6 version, try this PPA for Ubuntu!

Update March 22: this PPA now has Firefox 4 so I've updated the post. See: Install Firefox 4 In Ubuntu Via PPA Repository

[via ubucentrum.net]