I recently noticed that my Microsoft account remains active after I sign out if I press the back button. All my personal and account information is still displayed, indicating that the account is still signed in. I even tried clearing all browsing data and history, but that didn't resolve the issue. This doesn't happen with my Gmail account, nor when I access my Microsoft account using Edge or Chrome.

I understand that closing the browser likely signs me out, but I have no way to confirm that unless I check for active devices in my account settings. Can you explain why this timeout issue occurs? It seems odd, especially since Mozilla prioritizes security and privacy.