I see them all the time on internal websites. Corporate frontend devs favor Chrome and those sites aren’t automatically tested.

Miro board is simply unusably slow, but plenty of other commonly used websites have annoying breakages, like login screen not actually logging in and the others.

Facebook Messenger video chat. It straight up doesn't work. I have to open a Chromium instance to chat with my family.

Good example, but sounds like Facebook or Firefox are to blame for this, not Google.

The parent asked for examples of sites that don't work on Firefox. I gave him one. No one was talking about who to blame.