Imports a commonjs style javascript file with loadSubScrpt for restartless Firefox add-ons.

require.js

/* Imports a commonjs style javascript file with loadSubScrpt
 * By Erik Vold <erikvvold@gmail.com> http://erikvold.com/
 * 
 * @param src (String)
 * The url of a javascript file.
 */
(function(global) {
  var modules = {};
  global.require = function require(src) {
    if (modules[src]) return modules[src];
    var scope = {require: global.require, exports: {}};
    var tools = {};
    Components.utils.import("resource://gre/modules/Services.jsm", tools);
    var baseURI = tools.Services.io.newURI(__SCRIPT_URI_SPEC__, null, null);
    try {
      var uri = tools.Services.io.newURI(
          "packages/" + src + ".js", null, baseURI);
      tools.Services.scriptloader.loadSubScript(uri.spec, scope);
    } catch (e) {
      var uri = tools.Services.io.newURI(src, null, baseURI);
      tools.Services.scriptloader.loadSubScript(uri.spec, scope);
    }
    return modules[src] = scope.exports || scope.module.exports;
  }
})(this);

Work with pattern allowing module.exports for function assignment