I mean harmful by the fact that they might have ads, popups or other ways in which they might transfer malware to my phone or exploit vulnerabilities. And by visiting I mean interacting, clicking on items found on them, playing videos on them, like adult sites for an example of such a website.
Is there a sandbox or a VM on such Android phone that might help? Or am I secured if I have a basic antivirus, NoScript and an adblocker? Is there any you would recommend?