I’m a die-hard Firefox user (in part because I’m a web developer and prefer the dev tools). But I have seen a couple of sites that only work with Chromium-based browsers. Both are owned by Microsoft, though, so I assume they’re breaking things on purpose to push Edge or something. There’s no significant features Firefox is missing. (Safari is the problem child for web developers now. They tend to be last to support new CSS/JS features.)
I’m a die-hard Firefox user (in part because I’m a web developer and prefer the dev tools). But I have seen a couple of sites that only work with Chromium-based browsers. Both are owned by Microsoft, though, so I assume they’re breaking things on purpose to push Edge or something. There’s no significant features Firefox is missing. (Safari is the problem child for web developers now. They tend to be last to support new CSS/JS features.)