Firefox 3.1 is a major release with many new additions and fixes.

Mozilla opens Pandora’s Box in the Mozilla Wiki that a feature will be added to the next version of Firefox, a private browsing mode. This is a mode in which writes to cache, history, and other traces of the user’s browsing activity are blocked.

A note in the Wiki in a series of updates from the dev team states: “Private Browsing Mode: Ehsan went and implemented Connor’s functional spec bug 248970 - way to go! - now back on track for beta date ” Bug 248970 began in 2004 with a feature suggestion, noting that Apple’s Safari was going to get such a feature and Firefox ought to have one too.

In recent days we have received betas of both Internet Explorer 8 and Google’s Chrome that also implement a private browsing mode. Clearly Firefox needed this mode and the team was working on it. Only Opera is left without one.

To read more follow the link below

https://wiki.mozilla.org/Platform/2008-09-09#Firefox_3.1_Update