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Windows/Mac/Linux: The oft-delayed but much improved 3.6 version of Firefox has landed, offering up faster performance, one-click themes, safer add-ons and plug-ins, better font handling, and a lot more. Grab it now.

We’ve been downloading and trying out Firefox 3.6 from the first alpha, and from what we’ve seen, 3.6 is a bigger update than the minor decimal point iteration would indicate. It ranked second only to the cutting-edge Chrome builds in our speed and performance tests, which meant there was real improvement in startup time and page rendering.

What’s new? The video above provides the highlights, but the talking points are:

• Instant themes: Point 3.6 at the Personas gallery, and you can hover over a theme to see how it would look in your browser. Click to apply it, and it’s your browser skin. You can then manage your Personas from the Add-Ons menu.
• Out-of-date plugins notifier: Start your browser up with an outdated, and potentially virus-friendly, Adobe Flash or other plugin, and Firefox will tell you and provide an update link.
• Full-screen “open” video: If you’re looking at a video streaming in Ogg or another free format, Firefox can play it full screen.
• WOFF support: More intriguing for developers than users, but, still, Firefox now accepts and downloads smaller-sized Web Open Font Format fonts, allowing sites to more quickly show you their text the way they intended.
• Faster, faster, faster: Mozilla promises better JavaScript, startup time, and rendering speeds.

You can read up more on what’s new in the 3.6 release notes, but you’re probably going to want to discover its features for yourself.

Firefox 3.6 is a free download for Windows, Mac, and Linux systems.

Get Firefox web browser [Mozilla]

| Send an email to Kevin Purdy, the author of this post, at kevin@lifehacker.com |