A new version of Firefox is out today bringing the version number up to 13. Following their hyperactive schedule of updating each month the changes in this version are minor but noticeable.
The default home page now has quicker access to bookmarks, history, settings, and more
New Tab Page
When opening a new tab, you are now presented with your most visited sites
Under the bonnet in this release we see Mozilla enabling the SPDY protocol by default. The SPDY (pronounced SPEEDY) protocol is part of Googles “Let’s make the web faster” initiative and is designed to reduce latency and in turn speed up web browsing. This is an experimental protocol but as more services take advantage you should see an improvement in web browsing speeds.
To read more see http://www.mozilla.org/en-US/firefox/13.0beta/releasenotes/