From https://github.com/arkenfox/user.js/wiki/4.1-Extensions

`Cookie extensions

❗️Sanitizing in-session is a false sense of privacy. They do nothing for IP tracking. Even Tor Browser does not sanitize in-session e.g. when you request a new circuit. A new ID requires both full sanitizing and a new IP. The same applies to Firefox
❗️Cookie extensions can lack APIs or implementation of them to properly sanitize
    e.g. at the time of writing: Cookie Auto Delete`