I wouldn't switch to another browser just because Mozilla doesn't implement DRM. In fact that strikes me as completely the wrong reason to switch to another browser. Continuing to use Mozilla and boycotting services that use DRM is a more reasonable approach. The good news is there will likely be an extension and/or custom build of Firefox that removes the DRM. Of course this means we won't be able to watch the DRMed videos until someone cracks the encryption, but if we're boycotting them then that means we weren't going to watch them anyway.