[jrapdx3]

Couldn't disagree that FF has its deficits, IME it's not the best browser for videoconferencing. OTOH FF provides top-quality developer tools. And AFAIK preserves user privacy better than certain other browsers, Chrome being the poster child for the issue. FWIW FF remains unique and influential.

Ultimately judging what's "best in class" depends on exactly what criteria are applied. How old is the saying "one man's meat is another's poison"?

Anyway, the class of browsers is perhaps the most volatile in the software world, top of the heap changes constantly. But within it there are good examples of quality open-source programs and some that are not free at all. We decide on our own terms which among them is the "best".