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Phishing pop-ups on the lower right hand corner of my screen when using Firefox

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I think my firefox is infected in some way. I am constantly getting phishing pop-ups on the lower right hand corner of my screen when using the Firefox browser. They claim to be from McAfee, Windows and other legitimate places and tell me things like viruses have been detected, but scans of my computer do not detect any. They all come from something called 5qlql.azure.net or something similar to that.

I think my firefox is infected in some way. I am constantly getting phishing pop-ups on the lower right hand corner of my screen when using the Firefox browser. They claim to be from McAfee, Windows and other legitimate places and tell me things like viruses have been detected, but scans of my computer do not detect any. They all come from something called 5qlql.azure.net or something similar to that.

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Azure is Microsoft's cloud hosting service, so unfortunately, that could be almost anyone behind those messages.

Do the messages look like a desktop notification, as in this old example --

-- or the typical Windows-style notifications, or do they appear to be within the page itself, more like a kind of advertising?