Hell, you could compile the VM with an HTML5/JS target and get forward compatibility too.
Take HTML, JavaScript, and CSS, remove 90% of the cruft. Now, include what people want like a much better table element that by default can handle Adaptive screen sizes etc etc.
Chromium and Firefox are open source so you can probably get support in them by writing the code yourself. But, good luck gaining traction.
I feel the same instinctive feeling that we're just going back to the IE days, but is it possible that having all browsers align on a single rendering engine could prove to be helpful rather than harmful?
Which is baffling: I find myself in a situation that Microsoft was fined for
Unfortunately there are no extensions on iOS (I'm guessing due to Apple's policies).