... and most of that money comes in the form of sponsored browser/search integration w/ their competitors.

In that set of circumstances, the main qualification for CEO is likely 'plays nice with Google'. Given that, I'm not surprised that Mozilla underperforms.

Beating Google in the browser market might be considered hostile to their sponsors.

they are open source company, how can they decline to state? this is absurd, even regular companies do it.

But that includes bonuses for outstanding performance! /s