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dhtmlxCombo - firefox hangs while auto-suggesting.

firefox (3.5.5) hangs while auto-suggesting using the dhtmlxCombo. Works well in Safari though. Is there any browser specific constraint or hack I should be aware of?

<form method='POST' action='page2.php'>
<select id="cid" name="cname">
LOOP MYSQL DATA
<option value='LOOP.ID'>LOOP.CNAME</option>
END LOOP
</select>
<script>
var a = dhtmlXComboFromSelect("cid");
a.enableFilteringMode(true);
</script>
<input type=submit>
</form>

Please, provide a direct link to problematic page (or just demo but without server-side script)