This Firefox 4 Beta is considered to be stable and safe to use for daily web browsing, though the features and content may change before the final product release.Well. I guess that means the rest is just bug fixing before final release. No more new features to get all excited about. At least not until the next major version release.
As before, Ubuntu users can install the latest pre-Beta (now pre-Beta 11, or maybe it's pre-RC?) in Ubuntu 10.10 by adding the daily PPA, and installing firefox-4.0 and firefox-4.0-gnome-support.
~$ sudo add-apt-repository ppa:ubuntu-mozilla-daily/ppa
~$ sudo apt-get update
~$ sudo apt-get install firefox-4.0 firefox-4.0-gnome-support
|Firefox 4.0 menu entry|
Once installed there'll be a "Minefield 4.0 Web Browser" in you Applications menu.
|Firefox 4.0 main window|
Be careful when updating Ubuntu since there's also daily builds for Firefox 3.6.x in there.
Removing Firefox 4.0
To remove the Firefox 4.0 pre-Beta packages, you'll just have to uninstall the packages and do a PPA purge. While it's fast compared to Firefox 3.6, I'm not sure I quite like Firefox 4.0 on Ubuntu. The Windows version seems to "fit in" much better than the Linux release for some reason. It'll be the default browser for Natty so I think I'll enjoy 3.6's company just a little while longer.
~$ sudo ppa-purge ppa:ubuntu-mozilla-daily/ppa
~$ sudo apt-get purge firefox-4.0 firefox-4.0-core
...and your system should be clear of Firefox 4.0.
Installing Firefox 4 pre-Beta 8 on Ubuntu 10.10
Reverting PPA packages