No need for a browser extension, just throw this into your ~/.js

    var ampLink = document.querySelector('link[rel="amphtml"]');
    if (ampLink) {
      var href = ampLink.getAttribute('href');
      if (href) {
        location.replace(href, false);
      }
    }

EDIT: woa! this works really wall ;)

Interesting - What browser / OS is that file meant for?

Firefox: https://github.com/rlr/dotjs-addon

Chrome: https://github.com/defunkt/dotjs