index.js

var self    = require('sdk/self');
var pageMod = require('sdk/page-mod');

function notDataUrl(name) {
  return self.data.url(name).replace("/data/", "/");
}

function notDataRead(name) {
  return self.data.load("../" + name);
}

let { Cc, Ci } = require('chrome');

var modules = {
  mark_as_read: {
    toggle: function (params) {
      var self = this;
      let { search } = require("sdk/places/history");

      search(params)
        .on("end", function (results) {
        if (results.length > 0) {
          self.delete(params);
        } else {
          self.add(params);
        }
      });
    },
    delete: function (params) {
      console.error("Removing: ", params.url);
      Cc["@mozilla.org/browser/nav-history-service;1"]
        .getService(Ci.nsIBrowserHistory).removePage(params);

    },
    add: function (params) {
      console.error("Adding: ", params.url);
      Cc["@mozilla.org/browser/history;1"]
        .getService(Ci.mozIAsyncHistory).updatePlaces({
          uri: params.url,
          visitDate: new Date().toJSON().slice(0, 10)
        });
    }
  }
};

pageMod.PageMod({
  include: "*.ycombinator.com",
  attachTo: ["top", "existing"],
  contentScriptFile: [
    notDataUrl("lib/tools/utility.js"),
    notDataUrl("lib/settings.js"),
    notDataUrl("lib/modules/visual_theme.js"),
    notDataUrl("lib/modules/dark_theme.js"),
    notDataUrl("lib/modules/high_contrast.js"),
    notDataUrl("lib/modules/gray_visited_links.js"),
    notDataUrl("lib/modules/open_links_in_new_tabs.js"),
    notDataUrl("lib/modules/highlight_links_when_returning.js"),
    notDataUrl("lib/modules/infinite_scrolling.js"),
    notDataUrl("lib/modules/accurate_domain_names.js"),
    notDataUrl("lib/modules/mark_as_read.js"),
    notDataUrl("lib/modules/sticky_header.js"),
    notDataUrl("lib/modules/user_tooltips.js")
  ],
  contentScriptOptions: {
    urlBase: notDataUrl(""),
    defaultOptions: notDataRead("lib/defaults.json")
  },
  onAttach: function(worker) {
    for(var moduleName in modules)
    {
      var module = modules[moduleName];

      for(var actionName in modules[moduleName])
      {
        worker.port.on(moduleName + "#" + actionName, function(params) {
          module[actionName].call(module, params);
        });
      }
    }
  }
});