Instead of the loop, I prefer XPath queries to extract elements from the DOM:

    var query = "//td[@class='nodelets']";
    var nodesSnapshot = document.evaluate(query, document, null, XPath
+Result.ORDERED_NODE_SNAPSHOT_TYPE, null );
    for ( var i=0 ; i < nodesSnapshot.snapshotLength; i++ ) {
        var elt = nodesSnapshot.snapshotItem(i);
        // handle elt
    };
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