Old Greasemonkey/Tampermonkey script, but could be nice to have for people studying at Luleå University of Technology (LTU).

ltu_username.user.js

// ==UserScript==
// @name         LTU Username
// @namespace    https://gist.github.com/stefansundin/
// @homepage     https://gist.github.com/stefansundin/8214929
// @downloadURL  https://gist.github.com/stefansundin/8214929/raw/ltu_username.user.js
// @version      1.0
// @author       Stefan Sundin
// @description  Autofill username
// @include      https://logon.pub.ltu.se/cgi-bin/logon.cgi
// @include      https://fronter.com/ltu/
// @include      https://fronter.com/ltu/index.phtml*
// @include      https://weblogon.ltu.se/casfirst/login*
// ==/UserScript==

(function() {
	var username = "sunset-8";
	
	// Get url
	var url = window.location.toString();
	if (url.lastIndexOf("?") != -1) {
		url = url.substring(0, url.lastIndexOf("?"));
	}
	if (url.lastIndexOf(";") != -1) {
		// Stupid jsessionid
		url = url.substring(0, url.lastIndexOf(";"));
	}
	
	// Autofill
	switch (url) {
	case "https://logon.pub.ltu.se/cgi-bin/logon.cgi":
		// WLAN access
		document.getElementsByName("user")[0].value = username;
		document.getElementsByName("passwd")[0].focus();
		break;
	case "https://fronter.com/ltu/":
	case "https://fronter.com/ltu/index.phtml":
		// Fronter
		document.getElementsByName("username")[0].value = username;
		document.getElementsByName("password")[0].focus();
		break;
	case "https://weblogon.ltu.se/casfirst/login":
		// CAS (portalen, kurswiki, etc.)
		document.getElementById("username").value = username;
		setTimeout(function(){
			document.getElementById("password").focus();
		}, 150);
		break;
	}
})();