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Issue abstract:
Detailed description:Fantopis
Product & version number:
OS details:
What is the error message you are seeing?
If you have any supporting screenshots, please add them:
What browser are you using? Does this pop up on all websites, or just on a specific website?
It sounds like you may be seeing malformed ads on a website. Start by running a full system scan with your Norton 360. Then I would suggest a second opinion scan with the free version of Malwarebytes here. Malwarebytes focuses on some items that Norton does not.
Going forward, you might want to install an ad blocker extension in your browser to help prevent these ad popups.