Just read over at Asa Dotlzer's blog (Mozilla Q&A Guy) that Google is going to release an official toolbar for Firefox on the 7th July.

According to the post, it'll work on "Win2k/XP, MacOS X 10.2, and Linux 8.0+". Anyone know what Linux 8.0+ is? ;)

Source: http://mozdev.org/pipermail/googlebar/2005-July/001043.html
Via: http://weblogs.mozillazine.org/asa/archives/008440.html