There's no clear way to profit directly from these addons without doing something sort of spammy. The Mozilla platform just really isn't set up for it and it is

There's no clear way to profit directly from these addons without doing something sort of spammy. The Mozilla platform just really isn't set up for it and it isn't expected by users. I'm not going to make a ton of money developing small open source utilities, either. You either use it to a gateway into something else (paid consulting/contracting jobs, writing a book, landing a regular job, etc) or just keep it as a fun hobby if it is something you like. If you'd like to make money on the side focus on platforms where people pay for things or that have a clearer path for indirect revenue. (The web, Windows, Apple, Android, Facebook, etc.) I know it seems like the numbers are there and you're providing value but it would be an uphill battle. When focusing on income, your energies are better spent elsewhere.