Published at LXer:

Not long ago Mozilla changed the release cycle of Firefox, so that major new versions (Firefox 5, 6 and so on) will be released every 2-3 months. Currently, the latest alpha release is Firefox 6 Aurora, while the latest beta development version is Firefox Beta 5, which has made it into the Firefox Next PPA already. Installing this version should be very easy if you follow the next steps.

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Will never understand why Ubuntu and friends don't just download Firefox, extract, create a shortcut to launch. Two minutes of work and you have Firefox that autoupdates when Mozilla releases. No need to add yet another PPA to the million and one that already exist.

Mozilla/5.0 (X11; Linux i686; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 ID:20110413222027

Or why they don't use Iceweasel like Debian does.

$ apt-cache policy iceweasel
iceweasel:
Installed: 5.0~b3-1
Candidate: 5.0~b3-1
Version table:
*** 5.0~b3-1 0
500 http://mozilla.debian.net/ experimental/iceweasel-5.0 i386 Packages
100 /var/lib/dpkg/status
4.0.1-2 0
1 http://http.us.debian.org/debian/ experimental/main i386 Packages
3.5.19-2 0
500 http://http.us.debian.org/debian/ unstable/main i386 Packages