The bad news is that 12,000 other people would need to similarly pay per month to have a dev team of just 10. I know Ladybird is lean and mean but finding that big of an audience (or, of course, bigger) who would pay for a browser, per month, is likely a non-starter

It would be a much more interesting proposal to start a bug bounty for the damn near infinite Bugzilla queue, although as I understand it some of the hassle of a bug bounty program is evaluating submissions. And don't say "but we'll use an LLM" or I'll throw up in my mouth

You and approximately 5 other people. Paid browsers in 2024 are not a path to mainstream success, especially if you are what Firefox is - a fully independent tech stack down to the browser engine and not a barebones reskin of Chrome. A reskin of Chrome would have very low development costs. Firefox does not.