~$ sudo add-apt-repository ppa:mozillateam/firefox-stable
~$ sudo apt-get update
~$ sudo apt-get upgrade
There's another way to do the upgrade using Ubuntu Software Center that many would probably be more comfortable with. Either method will give the same results, so choose your poison.
|Firefox add-ons update check|
On a side note, those curious about download stats for Firefox 4 will probably like what they see on Mozilla's download stats page. It's a nice real time map of downloads worldwide, but be warned that it can lag older browsers and machines.
Reverting back to Firefox 3.6
Firefox 4.0 on Ubuntu 10.10 currently seems to have some issues with Flash 10.2. At least, it does on my computer. If things aren't going as well as you'd like then it's a simple command away to revert things back to the older Firefox 3.6:
~$ sudo ppa-purge ppa:mozillateam/firefox-stable
That should take care of things.
Firefox 4 Beta 12 arrived
Ubuntu Natty Alpha 3
Internet Explorer 9 releases with... not much really