It seems to me, as a news.google.com junkie who recently switched to Firefox (on mobile), that the site has some won't-always-refresh-when-loading issues. It might be Firefox's fault though.

Outside of Google-owned sites, many sites simply don't work properly in Firefox and require Chrome. Could it be the additional privacy features? It might be the web developers' fault, though.

Ever tried adwords? I think my first bug report of it not really working with other browsers was about 6 years ago, that time it was with Opera. My reports usually get verified but commented with "use Chrome instead".

Suggesting that their product works best in their browser is a world away from what MS pulled in the 90's, with the embrace and extend of standards.

I wonder how many relic Intranet apps force the use of old IE in Corporate world because they were built with the 'extended' dialect of JScript.

Google Meet, the hangout replacement if you schedule meetings in Google Calendar

Meet also works in recent versions of Firefox.