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Dowload new version You Tube HD Baris Derin

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I have received several messages when I started my computer form Baris Derin You Tube HD. He declares that everything is automatically downloaded. My question : is this download legal or not ? If not, how can I make sure that I don't will receive any further messages in future ?

I have received several messages when I started my computer form Baris Derin You Tube HD. He declares that everything is automatically downloaded. My question : is this download legal or not ? If not, how can I make sure that I don't will receive any further messages in future ?

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Baris Derin is an add-on developer, who provides the YouTube High Definition extension. https://addons.mozilla.org/en-us/firefox/user/baris-derin/

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So, I can rely on a legal version automatically and do nothing else with this kind of messages ?