One reasons some people use Rust is to target WebAssembly and WebGL. Will this change at Mozilla mean that evolving features in WASM, WebGL and other "advanced

One reasons some people use Rust is to target WebAssembly and WebGL. Will this change at Mozilla mean that evolving features in WASM, WebGL and other "advanced but it works on all evergreen browsers" features becomes a less interesting target as Firefox starts to fall behind the leading edge due to lack of developers, but still has enough users to make the "lowest common denominator" fall behind as well? Or will Firefox keep up somehow? Or will it stop keeping up, and site/webapp developers working with leading-edge web platform features like evolving WASM just drop FF from concern at the cost of a few percent more users? I know plenty of developers already don't test or know much about Firefox, and many sites don't work properly on it. I've had a number of commercial sites where I couldn't even login or couldn't pay except by switching to a different browser. But I have the impression people that folks working on leading-edge tech stuff are a bit more likely to include FF in their matrix, and the assumption is FF is quite up to date (more than Safari) so it's worth bothering with as an alternative target.