YMMV, but I'd rather prefer browser vendor to work on a browser, rather than try to become an operating system, with its own libraries and update channels.

A web browser shouldn't normally bundle image decoders, audio or video codecs, on-screen keyboards or printer and video card drivers.

Obvious exceptions apply, of course - e.g. if OS doesn't have built-in image decoder for a specific format it totally makes sense to bundle one.

But this is really getting off-topic.