[stevekemp]

WebDeveloper, uBlock Origin, and Tree-Style-Tab(s).

I'm sure there are businesses out there that make money with extensions, but I'm struggling to think of one that I've ever seen I'd pay for.

Lots of people post (chrome) extensions here, for example, but I don't use chrome so they're easy to ignore.

[silvaben]

My understanding is that an extension can be monetized in conjunction with a web/mobile app. Given the amount of free/open-source extensions, even I haven't been able to think of an extension that I would pay for.