Firefox 20 has better private browsing, new download manager
 

Attention Firefox users: version 20 of the browser is out. The Mozilla Blog has the goods on what's new in the latest release, including enhanced private browsing for both desktop and mobile versions. On the desktop, private browsing windows can now be launched "without closing or changing your current browsing session." The Android version has gained the ability to open private browsing tabs within a current session.

http://techreport.com/news/24601/fir...wnload-manager