[JohnBooty]

    Firefox performs poorly on Google properties 
    (Gmail is fine, YouTube, gsuite, admin consoles 
    are pretty bad)

I switch between FF and Chrome pretty frequently, and I've never felt any issues with YT or Gsuite. Haven't used the rest in multiple browsers so I can't compare.

There are some caveats to mention. One, I use AdBlock, and I'm subscribed to YT Premium so I don't see ads. Two, the documents I edit with GSuite are generally pretty trivial. Three, I've always used decently spec'd (not high end, but decent) computers so perhaps I'm not feeling performance issues that are felt on low end gear.

Still, I agree that's somewhat besides the point. Comapanies can (and do) decide to stop caring about Firefox at any point. There's no guarantee that Gmail will run well on Firefox tomorrow, or two months from now.