En el archivo interpreter.fireboard.inc.php busca
$tag_new = "<a target='_blank' href='http://".$_SERVER['HTTP_HOST']."joni-search/?url=".str_replace("&","$",str_replace("&","&",$tempstr))."'>";
Cambialo por
$tag_new = "<a target='_blank' href='http://".$_SERVER['HTTP_HOST']."/joni-search/?url=".urlencode(str_replace("&","&",$tempstr))."'>";
Busca
$tns = "<a target='_blank' href='http://".$_SERVER['HTTP_HOST']."/joni-search/?url=".str_replace("&","$",str_replace("&","&",htmlspecialchars($tempstr, ENT_QUOTES)))."'>";
Cambialo por
$tns = "<a target='_blank' href='http://".$_SERVER['HTTP_HOST']."/joni-search/?url=".urlencode(str_replace("&","&",$tempstr))."'>";