Implementing same with a current API.

current.js

var pageMod = require("page-mod");
pageMod.PageMod({
  include: "*.org",
  contentScriptWhen: 'ready',
  contentScript: 'postMessage({ handler: "reportLocation", data: window.location.href });',
  onMessage: function({ handler, data }) { this.messageHandlers[handler](data); },
  messageHandlers:{
    reportLocation: function(location) {
      require("notifications").notify({
        title: "Page Location Notification",
        text: "You are on the following page: " + location
      });
    }
  }
});

proposal.js

var pageMod = require("page-mod");
pageMod.PageMod({
  include: "*.org",
  contentScriptWhen: 'ready',
  contentScript: 'reportLocation(window.location.href);'
  messageHandlers:{
    reportLocation: function(location) {
      require("notifications").notify({
        title: "Page Location Notification",
        text: "You are on the following page: " + location
      });
    }
  }
});