As reported on ZDnet.com, Mozilla has moved an experimental security feature to the developer release. This changes the way Private Browsing, the equivalent of Chrome’s Incognito or IE’s InPrivate modes, deals with tracking user actions and behaviour across different websites.
The new version has Tracking Protection enabled for all Private Browsing windows by default. This means that if you want your browsing to be tracked you will need to disable the feature. If you have a website that you want to allow to track you then you will need to enable tracking for that site each and every session.
Mozilla believes that when you open a Private Browsing session that [...]
Mozilla Firefox browser users are being urged to update to the latest version of the open-source browser after a major vulnerability was found with the potential to steal sensitive data from user computers. The latest version of the browser is patched and now immune to the vulnerability.
Mozilla Firefox users on Windows and Linux platforms are being advised to update to the latest version of the browser (ver 39.0.3) due to an exploit being discovered in the wild which “searched for sensitive files and uploaded them to a server that appears to be in Ukraine,” Mozilla announced in a blog post.
Firefox 37 was released on March 31st, but less than a week later, on April 3rd, Mozilla was forced to release a patch that disabled many new features it had instituted.
At least on Windows, and possibly on Mac. At the 2015 Pwn2Own Contest in Vancouver, which is part of the larger computer security conference called CanSecWest, independent security researchers were able to execute exploits on all four major browsers. The victims were Safari on OSX, Chrome on Windows, Firefox on Windows, and, less surprising, Internet Explorer on Windows.