Mozilla is testing a new private browsing mode in Firefox that doesn’t just keep no trace of your porn browsing habits on your machine but that also blocks online services that could track you while you’re surfing the web. This new experimental feature is now available in the Firefox Developer Edition for Windows, Mac and Linux, as well as the Firefox Aurora channel on Android.

Even when you are in the private browsing mode, after all, online services can still track you through techniques like fingerprinting, even when they don’t have access to all of the cookies on your machine. If you’ve ever used a plug-in with this kind of functionality, you’ve probably seen sites that simply break under the unbearable pressure of not being able to track you. Just like these plug-ins, the experimental Private Browsing mode lets you unblock some trackers so you can still use these sites.