[1] [CITE[Opera ヘルプ: エクステンション(拡張機能)]]
( ([TIME[2011-02-07 19:27:16 +09:00]] 版))
<http://help.opera.com/Linux/11.01/ja/extensions.html>

[2] [CITE@en[Opera: Opera Extensions API guides]]
( ([[Frank M. Palinkas, Technical Writer]] 著, [TIME[2011-08-06 22:56:05 +09:00]] 版))
<http://www.opera.com/docs/apis/extensions/>

[3] [CITE[Welcome! - Opera 15+ extensions documentation]]
([TIME[2015-03-14 01:51:40 +09:00]] 版)
<https://dev.opera.com/extensions/>