A couple of years back there was an extension called Tab Mix that allowed users to have multiple rows of tabs to allow more to be visible at a time. A major revision to Firefox rendered it useless. Another user figured out how to allow multiple rows of tabs (https://www.youtube.com/watch?v=oVlLVySe5OI) which worked perfectly until version 131.0-64bit came out. Whatever was changed in it made the hack quit working. I really liked being able to see multiple rows of tabs because I tend to keep a lot open. I'm hoping that can be fixed with the next revision or two or that one of you has a different work-around.