So? If that’s what she’s worth then you either hire her, or put up with second best. You may think CEOs are paid too much overall - I’m not disagreeing, but let’s not pretend people who work for charities should all take charity salaries. If you want to build a world class product, hire world class people - they’re not cheap.
The absolute nosedive of firefox's share, its erratic and pointless development, the waste of money... in fact there are many valid criticisms against mozilla and its mismanagement, take your pick.
In a world set against you, even doing the right thing might not lead to success.
They are deeply dependent on Google; they’ve been trying to find revenue without Google. They’ve largely failed, but that doesn’t mean the strategy is wrong.