If Mozilla disappeared then I don't think that would imply the death of Firefox, I suspect there is enough motivation in the community to support a "successor"

If Mozilla disappeared then I don't think that would imply the death of Firefox, I suspect there is enough motivation in the community to support a "successor" fork to fill the vacuum. I'm sure the transition would be pretty awkward though, and it could have some negative implications on new WC3 standards in the short term. It ultimately depends on the "how" though, like if Mozilla were to act selfishly, they could get aggressive with the trademark and kill the brand recognition of a fork, possibly even requiring interface changes. Alternatively on the other end of the spectrum, if they simply passed Firefox in it's entirety to the community, it could possibly end up in a Thunderbird situation where it experiences a revival without a fork being necessary. Absent Googles funding, I think the best case scenario would be it's top leadership leaving as the budget stops being capable of sustaining the salaries critical for "supporting their families" and Mozilla gradually transitions into the non-profit it was always meant to be, soliciting donations exclusively for browser development. All while free from any concerns about pissing of Google and losing their main source of funding.