No, nor do they take equity.. They do provide a ton of "goodies". Credits to hosting providers, lawyers etc... And the mentoring is priceless.

See my answer above. We should tweak the site to make it clearer, thanks for the feedback.

Another thing you can make clearer is where you are based—I had to go to the blog to figure out it is Mountain View (I’ve seen a lot of things out of Mozilla London recently so I was hoping it was in London!).

It's location agnostic. Most teams aren't located near a Mozilla office. All of the program is virtual.

I'm near Mountain View so I spent many a days at the Mozilla HQ but none of the other teams were local.