TL;DR: Mozilla were already blocking third-party Cookies, so the ad industry started making webpages redirect to their domain (so that they could set a Cookie as first party).
Now Firefox will also automatically delete first-party Cookies that are known to be tracking Cookies.This excludes Cookies from webpages where you might legitimately be logged in, like Google or Facebook.
Thanks for the explained summary
Love TL;DR’s :)
Great news on the redirect blocking, especially if it works on big sites like medium
Right now, my browser saves hundreds or thousands of cookies. I would rather press a button to save cookies: make the saving of cookies Opt-in, otherwise (Without having the browser nagging me every second) delete them forever.
Most of the web seems to have been designed by people who had too much trust in the humanity