I'm just now trying to move over to Quantum Firefox after hanging on to pre-Quantum Firefox and other pre-Quantum forks as long as possible. Mainly, that's because I liked all my add-ons, especially Michael Kraft's Session Manager. It's saved me quite a few times with its automatic backup sessions. When I reach a large number of tabs, and Firefox is slowing down, I can just use Session Manager to save the entire session in one go. If I ever need to go back and find something, I can go searching through those sessions, and I can even go through the history of each tab to see how I got to a page. It's very useful, and that add-on works very well.
In doing a lot of research on Quantum F