It's weird how gcc and msvc end up in the same basket here. Mozilla say they're all about openness. gcc is a free and open source compiler, while msvc is propri

It's weird how gcc and msvc end up in the same basket here. Mozilla say they're all about openness. gcc is a free and open source compiler, while msvc is proprietary and closed source. I can see the case for keeping gcc supported, but if you don't have to support msvc, why would Mozilla give it more attention than for example icc?