Not sure where you got the idea that the core development team has been cut, Firefox development remains strong. For example, here's a 1,000+ line patch that just landed two days ago.
https://bugzilla.mozilla.org/show_bug.cgi?id=1779952
That's not the core dev team, at all. Servo was a research group, building an experimental browser engine, parts of which did end up transitioning across to Gecko.
pipeline_peak|3 years ago
https://www.protocol.com/amp/mozilla-layoffs-2646950077
Twirrim|3 years ago
devwastaken|3 years ago
Chromium can be extended in many ways. V8 can be used anywhere and is what spawned node and the idea of JavaScript server and client side.
Firefox is more like a product that's source available than an open source project made to benefit the ecosystem.
They would do better to finally pony up, reskin chromium, and stop playing catch up.
pipeline_peak|3 years ago