Firefox 15 is now officially available and it rocks a solid list of new features. Tablet users though probably have it the best, or the worst depending on how you look at it, as Firefox 15 comes with the new native UI for Android tablets. The latest Firefox 15 for Android (tablets included) is already in the Google Play Store.
If you've been using Firefox on your phone you know what to expect. The new UI not only looks better, but is significantly faster. Firefox should be on par with the native browser and Chrome or at least not feel sluggish anymore. The new AwesomeBar should be a nice bonus too.
Also new in the Android version of the browser is the ability to switch between the desktop and the mobile version of a site, a find in page feature and the "swipe to close" tab gesture. Firefox for Android is also available for download here