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Wow, this is really cool.

1. Can they copy extension to Opera Extensions? 2. If they add PayPal, I will donate. I don't trust other payment systems :)

They don't need to copy this on opera extensions. You just have to install this addon https://addons.opera.com/fr/extensions/details/download-chro... to opera. It allows to install any chrome extension directly from the chrome webstore.