<html> <body> <a id='link' target='_blank' href="http://example.com">Click me</a> <script> function clickLink() { // See testcase in bug 666604. var e = document.createEvent("MouseEvent"); e.initMouseEvent("click", true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null); document.getElementById('link').dispatchEvent(e); } addEventListener('load', function() { setTimeout(clickLink, 0) }); </script> </body> </html>