You might not know it, but Firefox was once widely considered to be an innovative browser. It wasn’t just an alternative to Internet Explorer (and now Chrome). Firefox introduced honest-to-goodness new features that people loved and rely on to this day.
The only reason I ever switch from Firefox to Chrome back in the day, was because Firefox was noticably slower and, at the time, had some other ongoing issues that forced me to switch.
It’s actually faster now and almost all the issues I once had are gone. The only one that remains is being able to use certain types of option selections on mobile (like drop down boxes, multi-selection, radial, etc).