Dev of the mentioned extension here, I've been getting emails from bad actors offering to "buy" the extension for years. It really has made me far less trusting of browser extensions.

If I can be bothered replying, I tell them it's open source, they can just use the code for free. Eventually if I push them on it, they tell me they just want to acquire the users, and don't care about the extension. I wonder just how many extensions are compromised this way, it's a mess.