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Announcing the Ladybird Browser Initiative
(ladybird.org)
This is a most excellent place for technology news and articles.
Firefox gets tons of funding from Google, and their code is quite frankly humongous. From what I understand, it's extremely hard to get the gecko web view engine to work. In another browser, unless it's a fork of Firefox, unlike Chromium where you can just redesign an entire browser around it.
It doesn't help that there's basically no documentation for how to use the Gecko engine either.
Neither Chromium nor Gecko have a stable public API. Companies are just willing to spend money rebasing every Chromium update.