Never encountered that, do you have an example?

A few years ago, T-Mobile's website actively blocked Firefox in Private Browsing mode. I filed an FCC complaint about that because I could not pay online and was being charged $5 to pay over the phone.

Today, MS Teams does not work in Firefox.

F1 TV

For everything else, there are the high-seas.

You’re right. Refers to the faq for more info but no faq found anywhere. What a shit site.

What? I use it (or its forks) exclusively and can't remember the last time I was blocked from anything.