Behold the newest version of Firefox for Android, Firefox 4, or 4.0 if you prefer, a browser that Mozilla is saying is clocking in at three times the speed of Android’s stock browser. They say there’s JavaScript engine tweaks (this is what’d make it much faster,) tabbed browsing (I hope so!), Firefox Sync, and yes, add ons! They’ve added an official walkthrough video of the new features and we’ve got it for you here below – descend upon it while you download the massive 13MB file from the Android Market!

Included in this new release is Firefox Sync, a sister that pulls all your desktop bookmarks, browsing history, open tabs, form data, and passwords to your mobile version, back to your desktop version, and back and forth again forever into infinity! This means you’ll only have to log into YouTube or Facebook in one place and you’ll be good to go anywhere you go! We’re happy there’s some HTML5 support in the mix, but sad to see a lack of Flash support. Surely this will be cooked up soon.

Oddly enough, this new version is also being offered up for Maemo, a Nokia software platform also made for mobile devices. Check out the big list of new items here in this official release, take a peek at that video, then check your download because if it’s not done by now, you’re not on a fast enough network – truth!

What’s New in Firefox for Android and Maemo:

Streamlined Interface

Focus on Web content: Features like tabs, one-touch bookmarking and browser controls that stow away when not in use help users focus on the websites they visit

Browse More, Type Less

Awesome Screen: Type less with easy access to history, bookmarks and open tabs

Save to PDF: Capture important websites, like directions or a boarding pass, to view offline

Share Page: Share websites via apps like email, Facebook, Twitter, Google Reader and more

Add Search Engine: Customize your search engine list.

Private and Secure Synchronization

Firefox Sync: Access Awesome Bar history, bookmarks, open tabs, passwords and form data across multiple computers and mobile devices with secure end-to-end encryption

Most Customizable: Firefox offers thousands of ways for users to customize the features, functionality and look of their mobile Web browser with Firefox Add-ons

Cutting Edge Tools for Web Developers: Firefox improves existing tools like CSS, Canvas and SVG to enable developers to make exciting Web pages

HTML5 support in Firefox for Android and Maemo includes Location-Aware Browsing, device orientation, accelerometer, desktop notifications and more.

The JavaScript engine incorporates the new JägerMonkey JIT compiler, along with enhancements to the existing TraceMonkey JIT and SpiderMonkey’s interpreter for faster page-load speed and better performance of Web apps and games