Mozilla has released Firefox 13.0 final! The official Firefox website hasn't been updated yet but you can download it from Mozilla's servers. Firefox 13 containing a number of major new features: redesigned home and new tab pages, support for "tabs on demand" loading of pages on restoring the previous browsing session to speed up startup, and a new Reset Firefox feature for attempting to fix major problems with a single click.
This new Home page provides users with the ability to create their own customised home page, with shortcuts to bookmarks, downloads, add-ons, history, sync, settings and an option for restoring the previous session. Users are presented with the option of using this home page when setting up Firefox 13 for the first time.
Download Firefox 13
Don't install it on Windows XP. Firefox 12 was the last version to support Windows XP RTM, XP SP1 and Windows 2000.