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Do you notice they pop up when you visit certain sites or all the time? It could be malware, but a lot of times it's just aggressive ads from pages you're visiting - first thing is to scan with a decent antivirus (Malwarebytes is reliable) and then check your browser extensions, which is usually the culprit.
Valentina1966 asker
They pop up all the time, even when the browser is closed. Thanks, I'll try Malwarebytes and check the extensions.
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