Earlier quoted context omitted.
As the OP says, the point is not that they needed unpaid work, if that's what you mean. The point is that volunteers shaped what Firefox, MDN, Thunderbird, Mozilla itself were.
This is why I refuse to donate to Mozilla, despite only paying for open source products, believing that 100% open source should be mandatory in every democractic government, Firefox and Thunderbird being my daily drivers for many years, and donating several hundred dollars every year on FLOSS projects. Many of Mozillas product decisions prove that the Mozilla corporation is not aligned with the interests of FLOSS. I…
"In 2018 she received a total of $2,458,350 in compensation from Mozilla, which represents a 400% payrise since 2008. On the same period, Firefox marketshare was down 85%. When asked about her salary she stated "I learned that my pay was about an 80% discount to market. Meaning that competitive roles elsewhere were paying about 5 times as much. That's too big a discount to ask people and their families to commit to."
In 2020, after returning to the position of CEO, her salary had risen to over $3 million. In the same year the Mozilla Corporation laid off approximately 250 employees due to shrinking revenues. Baker blamed this on the Coronavirus pandemic"