show iframes settings in popup
In popup make it possible to view both main frame page's settings and settings for pages that currently happen to live in iframes.
With pretty much any version of the GitHub registration fix, go to github.com/signup while not signed in, and click on the extension icon. Some of the time, you will see github.com/signup, but sometimes you'll see an iframe URL (from octocaptcha.com or api.funcaptcha.com) instead.
Go to https://stackoverflow.com/users/signup without a fix loaded (or with the cookie notice fix installed), possibly also has to be while not signed in, and click on the extension icon. Sometimes you'll see the stackoverflow signup URL, but sometimes you'll see a google.com recaptcha URL.