If your computer is shared by many people and if you are a regular user of Firefox Private browsing, then here’s the cool extension called PB Exit; that automatically closes the private browsing sessions when it’s not in use for 10 minutes. The extension can be downloaded from the Mozilla Add-on page. The extension is extremely simple as it doesn’t have any configuration settings. But the developer has hinted that he may add settings in the future.
The extension is really useful to the users who use Firefox’s Private browsing feature. Check out the extension here.