Mozilla Corporation is a sub of Mozilla Foundation. Mozilla Foundation controls Mozilla Corporation shares. Mozilla Foundation should based on the bylaws of Mozilla Corporation either have the board fire the C suite or replace the board of the Mozilla Corporation with those that will fire the C suite.
Mozilla Foundation is not doing that because it is not interested in changes. Running a large non-profit is a low effort, low risk, super lucrative job. The only way to affect Mozilla Corporation and Mozilla Foundation is for donors refuse to donate for Mozilla Foundation until it addresses the governance issues.
Un(?)fortunately, donations to the Mozilla Foundation are only a few million dollars a year--mostly because they don't do anything particularly interesting. (Seriously--look at https://foundation.mozilla.org/en/ )
If Mozilla is turning around to be a simple, ordinary business, that is quite the shark jump and will in turn lead to a large loss in advocacy. I have no interest in supporting a company just looking to make a quick buck if I'm not compensated.