Earlier quoted context omitted.
I hate to bring it to you, but every single one of your priorities have been long rejected: Thunderbird was officially discontinued like ten years ago, Mozilla had just let go a large number of devs in early 2020 and then again a couple weeks ago, among them all Servo developers. Even if you wanted to financially support Firefox or Thunderbird development through donations, there would be no way to. Your money will g…
Agree with all points except Rust and “standards”. The performance and stability of Firefox Quantum was largely driven by Rust. W3C standards are just out-of-date documentation. Do what’s good for the Web and the W3C will eventually document it.
W3C is mostly involved in CSS specs today, with significant influence on this past decade's advances, and also source of a lot of the complexity of browsers. CSS is a primary candidate for a formal spec among web standards IMO, since HTML5 the markup language is sufficiently covered by either the procedural spec or SGML.