Earlier quoted context omitted.
Gecko is too big to die. Even with Firefox’s market share being a shadow of its former self, it’s still used by millions. The real problems with Gecko is just that it’s harder to fork and has less compatibility with the web (that last part is largely just due to Chromium being the de facto standard so fewer people test their sites against Firefox).
> The real problems with Gecko is just that it’s harder to fork That goes contrary to my experience. I'm a maintainer of a Firefox fork (with rather extensive changes to a lot of the internals), and it is pretty manageable to maintain. We manage to keep it roughly up to date and add new features without financial backing or folks working full-time on it. If all you do is change the branding and apply some superficial…
Why do you think that very few projects adopt Gecko then?