From version 4 to version 9, Firefox moved fast in 2011 and is using less memory as a result of the updates. Mozilla summed up the year 2011 with an infographic on the Firefox blog.

7 times faster than Firefox 3.6, Firefox for Android, 25 billion items synced with Firefox Sync, 6% desktop adoption of “Do Not Track”, 480 million installs of Firefox add-ons, and a lot more accomplishments headline this year for Mozilla.