This issue is about two executables in ''C:\Program Files\Mozilla Firefox'': * ''firefox.exe'', which starts Firefox, and * ''private_browsing.exe'', which starts Firefox in Private Browsing mode. If you start ''firefox.exe'' while ''private_browsing.exe'' is running, it restores the last session. I have been experiencing this issue for about a year. Steps to reproduce: * Start ''firefox.exe''. * Open ''x.com'' instead of your home page, and ''xe.com'' on a second tab. * Exit Firefox (Alt+F4). * Start ''private_browsing.exe''. * Start ''firefox.exe''. * '''Actual result''': Three tabs are opened: ''x.com'', ''xe.com'', and your home page. * '''Expected result''': only your home page is opened. Can anybody confirm the bug? Will there be a fix for this?