Colour me baffled...
It surprises me that Firefox seems to take such ongoing criticism and constant negative comparison against the like of Chrome and IE/Edge for what amount to such minor functional niggles. In my experience, Firefox and 3rd party forks and derivatives such as CyberFox are as equally performant and stable as either of Google or Microsofts offerings.
But the killer for me is that (A) Firefox doesn't have the shady tentacles of some data slurping and privacy invading behmoth hard baked into it by design, and (B) the sheer amount of add-ons and/or secure custom forks allows me to assure myself that I can keep my browsing habits private as far as practically possible.
Which is just the way I want it.