Earlier quoted context omitted.
IPvFoo author here. The problem is that there's no way to obtain the (hostname, ip) stream from Chrome/Firefox without requesting the "all websites" permission. In theory, browser vendors could define a narrowly-scoped permission that only reports (hostname, ip), or roll this functionality into the browser UI, but neither seems likely to happen. I made IPvFoo to promote IPv6 adoption, and wouldn't consider selling it…
To determine ipv4/6, do you need to send that hostname and ip off to somewhere to get a response? or can it be done locally without leaving the machine?
https://developer.chrome.com/docs/extensions/reference/api/w...