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Previously, Firefox 4 beta was only available for Windows and now it’s available for the rest of us, too, except for the updated user interface, which is “coming soon” to the Mac and Linux.

Mozilla has opened, in a kind of sort of way, the Firefox 4 beta (features) to the Mac and Linux after a short Windows only run. As noted in the lead, the redesigned user interface isn’t yet available for Mac or Linux, though we finally do have Lorentz crash protection — take that Flash — which is about the only way to keep FarmVille from crashing Firefox.

This new version comes to market with a passel of new features:

• Tabs on top — Tabs are given top visual priority for more efficient, intuitive browsing
• Switch to tab — Navigate more easily by switching to open tabs from your Awesome Bar
• Firefox button — All menu items are in a single button for easy access, reduced clutter
• New add-ons manager
• WebM and HD video
• Improved HTML5, CSS 3 support
• JetPack SDK for faster/easier add-in development
• Crash protection (finally for the rest of us)

Get your copy of Firefox 4 beta click here (20.2MB).