Firefox released the Beta version its famous browser version (Version 20). The latest version offers some cool new features. The main features added on the version 20 is
1. Per windows private browsing, which will allow you to use private browsing on the needed tab only, this is a cool feature as you will not have to start the entire browser on private browsing mode.
2. You will be able to close add-ons when thgey hang with out hanging the browser, you may have felt this with Flash players some times.
3. New download experience with a new design, this will display a button with total progress of all the downloads.
Read more and download, before download you Must read the Known issues and also remember that this is a beta version and can have bugs.