The big question is:
Does the money go to Firefox or to funny projects and (what I consider) insane exec salaries?
So yeah, find me a way to finance Firefox only, and not the funny projects, and to ensure that not a single cent goes to their execs (neither directly nor through some creative accounting, where they reduce engineer salaries to offset the cashflow from this new stream, and pocket the savings), and you have my 10 bucks a month for the next 8 years (and possibly longer, but let's see what they do in 8 years). I won't move the goalposts and I'll make good on my promise.
Don't need execs coming in selling VPNs with the browser.
And that's why people are worried about where the money will go.
Bad engineering things are all because of execs?