Gmail Manager(Firefox Addon)와 같은 프로그램은 비밀번호 관리를 어떻게 하나요?

    if ("@mozilla.org/login-manager;1" in GM_CC)                                              
    {
      var loginManager = GM_CC["@mozilla.org/login-manager;1"].getService(GM_CI.nsILoginManage
      var nsLoginInfo = new Components.Constructor("@mozilla.org/login-manager/loginInfo;1", G
      var newLoginInfo = new nsLoginInfo(GM_PASSWORD_SITE, "/", null, aEmail, aPassword, "", "
 
      // Lookup the login info for this email
      var loginInfo = this._getLoginInfo(aEmail);
 
      // Check if the login info exists
      if (loginInfo)
        loginManager.modifyLogin(loginInfo, newLoginInfo);
      else
        loginManager.addLogin(newLoginInfo);
    }
    else
    {
      try {
        var pm = GM_CC["@mozilla.org/passwordmanager;1"].getService(GM_CI.nsIPasswordManager);
 
        if (aPassword != null && aPassword != "") 
          pm.addUser(GM_PASSWORD_SITE, aEmail, aPassword);
      } catch (e) {}
    }