Firefox 3.5 brings the world's second-most popular browser up to speed with current browsing technology and trends, and perhaps nudges it just a bit ahead of the competition. However, it is by no means the leap ahead that its predecessor Firefox 3 was, and it's clear that the competition isn't going away anytime soon.
Available for Windows, Windows Portable, Mac, or Linux, Firefox 3.5 nevertheless represents the best Firefox we've yet seen from Mozilla. This comes as no surprise, and with a testing process that involved four beta builds, three release candidates, and a version change to reflect what Mozilla described as the originally-unintended breadth of the improvements being made, most of the new features are no surprise, either.
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Source: CNET