Netflix limits video quality on Firefox although you can trick it with an extension. Then there is the fact that hardware accelerated decoding for Linux/X11 hasn't hit yet.

https://bugzilla.mozilla.org/show_bug.cgi?id=1619523

Anyway one valid solution is to add one or more app shortcuts that effectively run chrome/chromium --app=url and collectively treat these chrome specific apps as such. Instead of opening a new tab just click the icon on your bar.

This doesn't quite handle for example links however one could use https://addons.mozilla.org/en-US/firefox/addon/open-in-chrom... to click on links and send them to chrome for known problematic sites.

This is still way better than in the early firefox/IE days.

If it's a linux VM it could boot up quite fast right?

Definitely shame coveredca since that is a public service website.

Put that one out to some local media, social media, etc.

I haven't tried it with that site, but I generally find that chromium + changed useragent usually gets passed most checks like that.