yahoo.com is infected with malware
It appears yahoo.com is infected with malware. One various computers I get a random (maybe once a week) phony warning to "contact microsoft technical support". You either kill your browser or wait for it to go away.
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H Fiedler
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Thanks for your post!
Please review this help article: https://help.yahoo.com/kb/SLN4556.html for more information.
Thank you,
Yahoo Support