Private Browsing aims to help you make sure that your Web browsing activities don’t leave any trace on your own computer, noted Firefox programmer Ehsan Akhgar in a blog post.

The ‘Don’t Leave A Trace’ feature, as it’s being dubbed, was seen as being especially critical for version 3.1 as Google’s Chrome browser, the IE8 beta 2 and Apple’s Safari all already have it.

But, warned Akhgar, “Private Browsing is not a tool to keep you anonymous from websites or your ISP”. Neither is it a tool which can protect users from spyware. Instead, clarified Akghar, “Private Browsing is only about making sure that Firefox doesn’t store any data which can be used to trace your online activities, no more, no less.”

We hope that it manages to do it better than Google Chrome’s privacy mode, Incognito, which was slammed by advocacy group Consumer Watchdog the other day for being not nearly private enough.