One thing that is a huge improvement over the old version is the recovery feature. With the old version of Firefox, if you had a problem with one of the windows, all of the open windows would shut down. You would lose everything you were working on. I’ve lost many posts this way. Now, with this new version, it will recover all of your windows if you want it to. This has already saved me one post and a lot of research I was doing on multiple posts. Very helpful feature.