Yes, mozilla is desperate to diversify income so google can't shut them down, and if you are a manager who can usefully direct improvements and plans for a web browser project, google can afford to pay you basically any dollar amount to keep you out of the hands of mozilla, so they probably don't have stellar management.

Meanwhile firefox works well, is plenty performant, and isn't pushing "standards" that try to make it easier to advertise to me, against my wishes. Why would you use the browser made by an advertising company instead?