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. Previously, I gave it three stars because I couldn't use it at work, and rarely needed it at home. I updated it to four stars because I found a workaround. If you make sure every tab is loaded, and logged in, or gracefully logged out, and set it to not auto open the latest session, you can open every website, log in, then load your last session. Your tabs will load correctly, which usually means you don't need your history.

This is the explanation I previously wrote about my issues and the lower rating: The default Firefox session manager saves the history of every tab, which is incredibly important for me, but it also leaves me between a rock and a hard place. I have to use cloud software for work. It logs you out periodically. When you sign in, it will usually resume where you were; however, when you restart your browser, it resets the session, and after you log in, it lands you on the main page. If you have your tab history, you can navigate back to the page you were on; otherwise, you're stuck with 50 (to sometimes 200) 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 and 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 the task manager. If you sign out of your Windows account, restart, or your OS crashes, and you forget or are unable to kill Firefox from the task manager, you're completely screwed.