Firefox 4.0 Not Available in Ubuntu Synaptic Package Manager
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The general reason is that Ubuntu, like most of the other major distributions, does not add all the newest software to the reposities of every (supported) OS version right when they're released, for a variety of reasons (takes a lot of time in testing, packaging, following updates etc., potentially forces updating loads of other packages, and so on...) Fixes are added, especially security related, but major updates are typically added only to the next (or next to that) version, when other things are updated as well (required libraries, for example). That's why you don't get the newest Gnome desktop to the older/current version right at the release day, but only when the next version is out.
With Firefox you can also get around this easily by copying it to your disk manually, and running it from there. Has worked with previous versions, should work with this one too. Or use the "extra" reposities, like mentioned.