I've used this addon for many years and I honestly love it, but I found an issue that unfortunately I cannot overlook at work- it doesn't save history. If you don't need your history after closing the browser then this is a 5-star addon, and that's why this still gets 3 stars despite the fact that I cannot use it anymore.

The default Firefox session manager saves the history of every tab, and that is incredibly important for me, and leaves me between a rock and a hard place. I have to use a cloud software for work. It logs you out every so often and when you sign in, it will generally bring you back to where you were; however, when you restart your browser it resets the session and after you login it lands you on the main page. If you have you tab history, you can navigate back to the previous page and continue where you left off, otherwise you're stuck with 50 useless tabs and a mess trying to figure out what you were doing. On the other hand the Firefox session manager can save only one session ad is incredibly inconsistent, it's a coin flip whether it will work after a crash and the only way to guarantee a session is saved is by killing Firefox from task manager. If you sign out of your Windows account, restart, or you OS crashes, and you forgot or where unable to kill Firefox from task manager, you're completely screwed.

If it were possible for this addon to save tab history I'd still be using it.