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I'll make this short:

Firefox 4 has been officially released and is available to download @ http://www.mozilla.com/en-US/firefox/new/

If you want to run it on Linux, close any running Firefox instance, extract the downloaded archive and double click the file called "firefox" (not firefox-bin!).

Ubuntu: see how to install Firefox 4 from a PPA

To see what's new in Firefox 4, check out the following video:

For a complete list of new features, see http://www.mozilla.com/en-US/firefox/features/