Note that the Cookies setting Firefox enabled for new users is “Block third-party trackers”. While there is a more restrictive “Block all third-party cookies” o

Note that the Cookies setting Firefox enabled for new users is “Block third-party trackers”. While there is a more restrictive “Block all third-party cookies” option available, that’s not the same thing and as above suggests, the “all” option will break some sites (such as single sign-on) that the trackers-only option will not.