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malvertisement website redirect 21
Whenever I open Firefox (Firefox Quantum) I get the following message pop up " Norton blocked an attack by: Web Attack: malvertisement website redirect 21". Clicking on details tells me the attacking computer, source address, etc. Obviously I've run NIS, as well as Malwarebytes and the Malwarebytes Anti-Rootkit with no success.
Any help gratefully appreciated!