2015-04-08 Opera 28.0.1750.51 Opera stable 28.0.1750.51 update ブラウザ ID Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.118 Safari/537.36 OPR/28.0.1750.51