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* cottonTracks
** https://addons.opera.com/ja/extensions/details/cottontracks/?display=en

* Akari URL Shortener
** https://addons.opera.com/ja/extensions/details/akari-url-shortener/?display=en

* TabHamster
** https://addons.opera.com/ja/extensions/details/tabhamster/?display=en

* Evernote Web Clipper
** https://addons.opera.com/ja/extensions/details/evernote-web-clipper/?display=ja