>Firefox's marketshare has plunged so far that it's getting harder to keep using it on the web

any examples? i only use firefox, including for work, as well as encourage all of my students to use it, and i cant think of any sites that dont work.

if anything, i would say its sort of the opposite (getting easier to use). some microsoft websites were wonky ~5 years ago, but now all seem to work perfectly in firefox.

I fairly regularly come across websites that are broken even in normal Firefox, like, even on Hacker News. I've had to use Chrome for some local government stuff but I reckon they broke Firefox on accident rather than on purpose and hopefully it is fixed now. Google's own Cloud Console was unusable in Firefox for a couple weeks a few years ago :) This is very different from sites not explicitly supporting Firefox, but it does happen. If I think of/find an explicit example of something broken right now I will link it here.

To be completely fair, some of it isn't really by choice. Like, the qmk configurator doesn't support Firefox, but that's because it needs APIs Firefox intentionally doesn't have. Should Firefox have these APIs? The WebUSB thing doesn't personally bug me the way Chrome implements it so I'd say sure. I'd certainly prefer having that over EME.

Government websites tend to be an issue.

Had to spend an hour on the phone trying to figure out why my dad couldn't access a government portal. Only supported on Chrome.