But all of them are Chromium based, so are either going to be crippled by the Google proposal in the article, or they're going to diverge more significantly.
But if they added extensions (which mobile Chromium doesn't support at all), they're not shy about divergence.
Not meant as a comment on the proposal or FF vs Chromium.
This (v3) proposal, and the slick rewrite of Mozilla's stuff probably means I will be off of Chromium for mobile and desktop some time in the hazy future.