People like only certain things about Mozilla, most of which aren't due to execs. Firefox being well engineered (and not having meddling pointless features such as "Colorways") and up on the latest standards, good engineering representation in browser standards from a non-Google, and MDN. That'll do. Oh, and Rust, but the execs already did for that.
Don't need execs coming in selling VPNs with the browser.
And that's why people are worried about where the money will go.