20% less would be already quite meaningful. Add to that volunteers who work completely for free, and this could give an edge and I would argue, that this is mainly what keeps firefox alive. Despite their management increasingly acting like a ordinary company.

"In 2018 she received a total of $2,458,350 in compensation from Mozilla, which represents a 400% payrise since 2008.[14] 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." "

https://en.wikipedia.org/wiki/Mitchell_Baker#Mozilla_Foundat...