I wonder if everyone in this thread is willfully missing the point, or else if we're just so deep into the brainwashing of the modern web that they can no longer see the surface.
Why? I actually think it’s pretty clean. You have a one-to-two letter opening tag and an equivalent closing one.
Markdown looks aesthetically nicer and is easier to type, but it’s less precise.
Maybe it would, slightly. But would it make the browser anymore complicated then the unessential features that Firefox has in its default build right now?
Pocket integration, FF Sync, some screenshot function?
The web is so broken that my Firefox even has some Protection Dashboard thing (about:protections). Not that I've ever used or noticed it before.