A new browser extension published dubbed Behave! that warns the user if the website tries to perform a port scan or launch DNS based attacks.
The web sites port scanning issue came into light after a script found on the eBay website that performs local port scans on a user computer to check for remote access.
The extension is available to download for Firefox and Chrome browsers. You can also disable or enable alerts.
https://github.com/mindedsecurity/behave
more here
Browsing: What Could Go Wrong?
There's so much literature about client side attacks, but most of the focus is usually about classical malware attacks, exploiting software vulnerabilities
https://blog.mindedsecurity.com/2020/06/behave-monitoring-browser-extension-for.html
i'd read this blog from the makers of that extension if people are gonna use this extension and want more info on what it actually does