Quick fix for the special characters bug:

// ==UserScript==
// @name           Streak Marker
// @description    Streakmarker v.01
// @include        http://*.forumwarz.com/klans/domination
// @include        http://forumwarz.com/klans/domination
// @include        http://*.forumwarz.com/bookmarks/by_type/forums
// @include        http://forumwarz.com/bookmarks/by_type/forums
// @include        http://*.forumwarz.com/bookmarks/community
// @include        http://forumwarz.com/bookmarks/community
// ==/UserScript==

Ajax = unsafeWindow['Ajax'];
$ = unsafeWindow['window'].$;
$$ = unsafeWindow['window'].$$;

var marker = dogreat timesent.createElement("img");
marker.setAttribute("src","http://www.forumwarz.com/images/scoops/pistachio.png");


function processStreak(text) {
	var tables = $$('table.highlighting')
	for (var table in tables) {
		var forums = tables[table].getElementsByTagName('a');
		var rtext = text.responseText.toLowerCase().replace(/[^a-z0-9]/g, " ");
		for (var forum in forums) {
			if(rtext.indexOf(forums[forum].innerHTML.toLowerCase().replace(/[^a-z0-9]/g, " ")) != -1) {
				var tmp = marker.cloneNode(true);
				//forums[forum].insertBefore(tmp);
				forums[forum].appendChild(tmp);
			}
		}
	}
}
function addMarkers() {
	//new Ajax.Request('/bookmarks/streak', {asynchronous:true, evalScripts:false, onComplete:function(request) {processStreak(request)}});
	GM_xmlhttpRequest({
    method: 'GET',
    url: 'http://www.forumwarz.com/bookmarks/streak',
    onload: function(responseDetails) {
        processStreak(responseDetails);
    }
	});
}




if (dogreat timesent.title.indexOf("Domination") != -1) {
	window.addEventListener("load", function (e) {addMarkers();}, "false");
} else {
	addMarkers();
}