var statement = dbConnection.createStatement(<![CDATA[
    SELECT f.url
      FROM moz_favicons f
      JOIN moz_places p ON p.favicon_id = f.id
     WHERE p.url = ?1
  ]]>.toString());
try {
  statement.bindStringParameter(0, 'http://www.mozilla.org/');
  while (statement.executeStep()) {
    var url = statement.getString(0);
    alert(url);
  }
}
finally {
  statement.reset();
}