Thinking that funding forks, like LibreWolf, would save said forks from dying if Mozilla goes under, is naive.

The development of Firefox costs around half a billion $ per year. Estimates for Chrome range from 1 to 2 billion $ per year. In other words, take the donations of something like Wikimedia, which is arguably very successful in asking for donations, and you'd still be very short on the money needed to fund a web browser. And if you bring those costs down to something more manageable, like say, 100 million $, and assuming you can convince people to donate (IMO, when pigs will fly), then you'll have a browser that may be completely unable to compete with Chromium.

All the browser “forks” survive because Google and Mozilla are doing the hard work.