“getElementById not a function” when trying to parse an AJAX response?

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Use DOMParser() to convert responseText into a searchable DOM tree.
Also, your attempts to search/use anything derived from responseText, must occur inside the onload function.

Use code like this:

GM_xmlhttpRequest ( {
    ...
    onload:     parseAJAX_ResponseHTML,
    ...
} );

function parseAJAX_ResponseHTML (respObject) {
    var parser      = new DOMParser ();
    var responseDoc = parser.parseFromString (respObject.responseText, "text/html");

    console.log (responseDoc.getElementsByTagName('div'));
    console.log (responseDoc.getElementById('result_0'));
}

Of course, also verify that a node with id result_0 is actually in the returned HTML. (Using Firebug, Wireshark, etc.)

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