Yup, those would also be great UX improvements. Firefox used to have something like “Show tab overview”. I think it was called Panorama? I might try looking for it to see if it still exists and works.

edit: the problem with relying on extensions for all of this is that it’s not cohesive. I found that to be the main problem with Firefox that makes me put it a tier lower than everything else right now.

Yes, also if you work at a company that locks down the machine its likely you can't install browser extensions.