We have both remote and office employees. We have offices around the world and it's very common for people who formally work there to mostly work from home anyway, because we're so remote-friendly that it doesn't matter. So in many ways we're more all-remote than anything else. The offices are optional, a nice bonus for when you feel like going there.
Interesting, good to know. Or, well, it would be if I applied for one of the Mozilla jobs in Portland I periodically see. Just saw Staff Engineer pop up and it looks appealing, but even with 20 years of experience I don't know that I'd feel qualified applying.