Brendan Eich has a helpful chart of Compensation of Highest paid executive at Mozilla vs Firefox market share over time.
https://twitter.com/BrendanEich/status/1217512049716035584/p...
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https://twitter.com/BrendanEich/status/1217512049716035584/p...
As well, according to the same Wiki, "There will be no shareholders, no stock options will be issued and no dividends will be paid." It would be a bummer to run a company of that size, be dedicated to it for so long, and not have any stake in it. Imagine her opportunity cost...
There are greater goals, especially for a company like Mozilla, than making lots of money.