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How Skype Click to Call plugin is used to send spam?

My friend had Skype Click to Call plugin installed within browser on Mac OSX. And his Skype account started to send some automatic spam messages linking to lose weight websites (via goo.gl) without ...
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Question about the Perspectives add-on, is this dangerous?

When I visited Google and Facebook, and then clicked on the Perspectives add-on button to check the certificate information, I saw this:     What does this mean? Shouldn't it have ...