Organizations always grow, since the entire point of an organization is to exist for the sake of its stakeholders. The bigger it is, the better for stakeholders.
Willingly burning 85% of your revenue and downsizing isn't something that stakeholders want.
Odds are Mozilla will simply die and their browser with it, since the Chromium based ecosystem is much more robust.
NGOs and government organisations follow the same pattern. They all expand, hire, and the people within each org all have a vested interest in the organization expanding and keeping them all employed, given raises, etc...
Substantial Organizations - whether capitalist, non-profit, or other - give a great deal of power to their leaders, and jobs to their workers. Those folks - most especially the former - may give lip service to the org's supposed mission...but their for-sure #1 priority is looking out for their own interests.