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).
Global market share held by leading desktop internet browsers
Chrome Safari
May '18 66.93% 5.48%
Apr '18 66.17% 5.48%
Mar '18 66.93% 5.37%
Feb '18 67.49% 5.42%
https://www.statista.com/statistics/544400/market-share-of-i...
With Firefox being the only independent rendering engine and that's been on a downwards trajectory.
[0]: https://www.cnet.com/news/mozilla-investigates-mr-robot-fire...
What will those people say if they ever decide to break the browser into a core and user visible plugins?
Web developers would rather have a single good engine, assuming that it's good enough and continuously developed.
IE failed back when they all but ceased development for a number of years and since it was closed source nobody could take it over.
Google certainly thinks so when they check the Firefox user agent on Android and give them a some cut down mobile version.