Ah, yeah, I don't think that many people have the extension installed yet, but I can see them not requiring big sites to add a monetization header and just sending the money to them instead.
We're working to make the Web Monetization API a standard that browsers can adopt natively: https://webmonetization.org
The extension helps us bootstrap the ecosystem but a native integration is far superior. Check out Puma browser for an example of the integrated experience for mobile.
