On the other hand, the Google money accounted for around 85% of their income over the years, so if they hadn't been spending it they would have been operating on around 20% of the income for many years while the endowment grew, and likely would not have been able to keep up with competing browsers.
Also, for as much crap as she gets, Mitchell Baker invested over 20% of the Google money Mozilla received during her tenure, far more than was invested by prior CEOs. And before anyone brings it up, all that "woke activist" spending comes from donations, not Google money, which the IRS prohibits them from spending on browser development.