Always appreciate any work spent on any FOSS stuff out there but currently I’m a bit afraid that Gecko disappears into unimportance. So I’d prefer more contributions towards that one project rather than opening new ones.
The issue with browser engines is that it always requires work from two directions. The browser engine must be optimized to render websites as good as possible. And websites must be optimized to be rendered by all the different browser engines.
And (almost) no one is willing to do the latter for engines with a <1% market share. Already now, more and more commercial and non-commercial websites are only working properly with Chrome or its derivates.
I guess if we as humanity focused on producing only high quality and essential, basic products (food, housing, clothing) + the tools and processes that we need in the supply chain, we could massively reduce labor and reduce our ecological footprint at the same time. But our current economical system is depending on everyone doing something, everlasting growth and consumption.