There's a bunch fo websites (Atlantic being notable) that tell me I'm using an ad-blocker and ask me to turn it off. I'm not. I'm using stock Firefox.

So, I guess their conversation goes:

> We block Firefox (but don't know that we do so)

> We don't see many Firefox users

> Why do we optimise for Firefox?

It's mildly frustrating that they block users for dumb reasons. (Again, I'm not blocking ads). But it's only a mild frustration - there are a gajillion places to get news that are better than Atlantic.