Comment 7 for bug 512236

Sorry, the patch above do fix the problem:

 if(_SARISSA_HAS_DOM_CREATE_DOCUMENT){
        if(window.XMLDocument){
            /**
            * <p>Emulate IE's onreadystatechange attribute</p>
            */
            XMLDocument.prototype.onreadystatechange = null;
            /**
            * <p>Emulates IE's readyState property, which always gives an integer from 0 to 4:</p>
            * <ul><li>1 == LOADING,</li>
            * <li>2 == LOADED,</li>
            * <li>3 == INTERACTIVE,</li>
            * <li>4 == COMPLETED</li></ul>
            * FB har ukommateret
            * XMLDocument.prototype.readyState = 0;
            */
            try {
                XMLDocument.prototype.readyState = 0;
            } catch(e) {
                // XXX on some browsers (Firefox 3.6 at least) this fails,
                // however I think this is rarely a problem so we just
                // ignore it here...
            };

            /**
            * <p>Emulate IE's parseError attribute</p>