hidden about:s

scratchpad.js

var abouts = (function({classes: Cc, interfaces: Ci, utils: Cu}) {
  const {Services} = Cu.import("resource://gre/modules/Services.jsm", {});
  return Object.keys(Cc).map(function(e) {
    var m = e.match(/about;1\?what=(.+)$/);
    if (!m)
      return null;
    m = "about:" + m[1];
    var s = Cc[e].getService(Ci.nsIAboutModule);
    if (!(s.getURIFlags(Services.io.newURI(m, null, null)) &
      Ci.nsIAboutModule.HIDE_FROM_ABOUTABOUT))
      return null;
    return m;
  }).filter(function(e) !!e).sort();
})(Components);
console.log(abouts.join("\n"));