A SECURITY FEATURE which gave punters total privacy has been dumped from the final version of Firefox 3.
Private Browsing would have disabled all caching, cookie downloads, history records, and form data during the session.
If it worked it would have meant you could surf the Web and leave nothing sticky on your computer. (The Inquirer)
Eine Alternative ist die Firefox-Erweiterung Stealther, die einen ähnlichen Funktionsumfang bietet, aber halt nicht standardmäßig dabei ist.