rem: const ss = Components.interfaces.nsIShellService; var shell = Components.classes["@mozilla.org/browser/shell-service;1"].getService(ss); shell.openPreferredApplication(ss.APPLICATION_MAIL); 
add: var shell = getShellService(); if (shell) shell.openPreferredApplication(Components.interfaces.nsIShellService.APPLICATION_MAIL); 
context:   readMail: function ()  {    const ss = Components.interfaces.nsIShellService;    var shell = Components.classes["@mozilla.org/browser/shell-service;1"].getService(ss);    shell.openPreferredApplication(ss.APPLICATION_MAIL);  },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/27730e1df0ce18d780418d217500fab6793c9c81/browser.js/clean/browser/base/content/browser.js