I say this every time it comes up. I would happily pay $5/month for a “platinum” branded Firefox browser if that $5 would go to support development costs. I’d love to have other people see it when I share my screen both inside and outside my organization.

Indeed.

And something like apple's iCloud relay. I would pay for that.

I won't pay for a Mullvad subscription that's less useful than actual Mullvad because it just works in the browser and it doesn't fix all the issues iCloud relay solves.

If they'd sell actual privacy features I'd pay for it totally. Sync too.