Nearly two weeks after Mozilla unleashed the first beta of the supercharged Firefox 3.1, the open-source organization unveiled a much anticipated private browsing feature scheduled to debut in the beta 2. Better known as "Porn" mode, a private browsing session enables you to surf the web without leaving traces of your web activity on a computer, which is useful when you need to use a friend's computer or a public terminal. Chrome, Safari and IE8 offer private browsing modes called Incognito, Private Browsing, and InPrivate, respectively. Firefox 3.1 will be the first release to incorporate the feature by default, eliminating the need for a third party add-on.

Although current Firefox versions allow you to clear private data accumulated over browsing sessions, you can't delete items from a specific period of time like in Chrome or remove specified data of your online activities which you do not want to hide. For example, if you choose to clear the history, all browsing history will be erased so Firefox will no longer be able to find a web site you visited earlier.

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