go back if the ed2k/magnet is opened in current tab; else close tab.
go back if the ed2k/magnet is opened in current tab; else close tab.

sdgdsffdsfff/xunlei-lixian-web,wangjun/xunlei-lixian-web,iambus/xunlei-lixian-web,wangjun/xunlei-lixian-web,sdgdsffdsfff/xunlei-lixian-web