Styling XUL applications like web pages

reload_stylesheet.js

(function() {

for (var child, i = 0, length = document.childNodes.length; i < length && (child = document.childNodes[i]); i ++) {
    if (child.nodeType === 7) {
        if (child.nodeValue.indexOf('aero') > 0) {  /* UPDATE: 'aero' with a keyword from your file name */
            child.nodeValue = 'discard="discard"';
            document.removeChild(child);
        }
    }
}

var pi = document.createProcessingInstruction('xml-stylesheet', 'href="file:///D:/Workspace/public/komodo-aero-theme/src/skin/aero/theme.css?' + (new Date().getTime()) + '" type="text/css"');  /* UPDATE: with path to a local resource; keep new Date()... */
document.insertBefore(pi, document.firstChild);

})();