[BetaNews] - The public beta of Mozilla’s first Web browser that features a private browsing mode is available to the general public today, although the organization has yet to make it official.

As promised, Firefox 3.1 Beta 2 does incorporate private browsing mode (also called “porn mode”) in which browsing history, cookies, and other traces of where the user has been, are not recorded for the duration of the session.

The new TraceMonkey JavaScript engine, which is supposed to expedite Web functionality by orders of magnitude, is also incorporated and turned on by default, according to Mozilla.

On the other hand, Acid3 test score over previous builds: up to 93% from 89% for an internal build last October. The Acid3 test helps determine whether a Web browser renders pages in accordance with methodologies set by the major Web standards agencies and the development community.

Read more