Hello, I am on an Imac using Mac OS 10.13.6 High Sierra. I did the following in order. 1. Yesterday I downloaded FireFox 89.0. I'm having problems with my eyes so the tabs being the same color as the screen made it impossible for me to use. All history, tabs and bookmarks were available at this point. 2. This morning downloaded FireFox 88.0.1. When I opened it up I lost all my history, tabs and bookmarks. 3. I then opened up FF 89 again thinking that everything was updated to that version and I would reacquire my lost history etc ... I did not ... everything was missing. 4. Did the same for FF 88 and history et al were still missing. 5. I just checked my ~library/Application Support/ FireFox/Profiles and in addition to my original i86vhe6t.default and lzsayqt6.default-release there are 3 new profiles I'm assuming were a result of steps above. I'd like to use FF 88 and recover all of my history, tabs and bookmarks as close to before I downloaded FF 89 as possible. Can you please help instruct me as to how to do that. thanks. ... Later: After I originally wrote the above, I somehow managed to get back all of my settings but in FF89. I'd like to update my request to get information to use a previous version of FF with all of my settings. It seems when I launched FF88 and tried to change the profile to what I wanted, it wouldn't let me. Curleyhead