People who are working remotely from Eastern Europe or other remote locations are almost always coming to Mozilla into a more senior position, with very demonstrable skills, and typically have access to more of the market than just what's available locally, and I believe we take that into account (but again, I haven't personally been involved in compensation discussions in those areas). Still we make a distinction in terms of cost of living, and realistically the Bay Area just has a different labor market than elsewhere – so to be competitive in the Bay Area while also hiring elsewhere it makes sense to differentiate to some degree.
Agree, SF/Bay Area is somewhat an exception. That's why I mention "North American" generally. To further differentiate - "Seattle" level could be fine, while "midwest" not so much ;)