Google Chrome is likely around $400M, while Mozilla's core browser team is around $200M but are technologically far behind. Hard to find precise numbers, it's just an order of magnitude estimate
In what sense is Mozilla behind? Chrome is an advertising delivery platform, they have fundamentally different goals and that $400M they spend on Chrome is not mostly going to technology that I want in my browser, that's the point. Just because Chrome builds telemetry features doesn't mean Mozilla needs them too.