// ==UserScript==
// @name           WebAuth Tick Jumper
// @namespace      http://bumph.org/webauth
// @description    Skip the green tick page.
// @include        https://webauth.ox.ac.uk/login*
// ==/UserScript==

var link = document.evaluate("//a[@class='go_button']/@href", 
	document, null, XPathResult.STRING_TYPE, null).stringValue;
if(link) {
	window.document.location = link;
}