Your Yahoo Canada news site is allowing false security alert pop-ups.
Several times when I attempted to comment on news on the Yahoo Canada site I full screen pop-up came up stating I have a serious security issue and contact Windows Technical Support at (866) 877-0206. It is a phishing scam of course, but they are using Yahoo.
Since it has a Windows type logo on it I have reported this to Microsoft, but it continues to pop up on your site, while I am signed in.
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Barry Ewing
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MidiMagic
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That is most likely residing on your own computer.