Mozilla has released the second beta version of Firefox 3.1, you can grab it over here. New in this beta is the Private Browsing Mode, Mozilla suggests this is perfect for "online holiday shopping" but I guess most people will use this for something totally different..
This beta is now available in 54 languages - get your local version and let us know if it looks right.
A new Private Browsing Mode that allows you to browse without Firefox storing any traces of where you’ve been - perfect for online holiday shopping!
New functions that make it easy to remove the history of your past few hours of browsing, or remove all traces of a website.
New support for web worker threads.
Improvements to the Gecko layout engine, including speculative parsing for faster content rendering.
Removed the new tab-switching & preview behavior based on feedback from Beta 1 users