I quite well understand what tracking cookies are and what they're meant for.
Similar to you "who are proactively protecting [y]our privacy", I use Firefox's built-in TRACKING PROTECTION to block sites which use trackers; I can disable that feature if it's compromising access to any given site, either per session or permanently. (In the latter sense it functions almost exactly like Adblock Plus.)
Thanks for clarifying you original post.
First, this: Firefox's Tracking Protection, which I believe
you can make use of only in private browsing mode, is
"Always" available beginning in v 57.
It sounds like the same functionality Apple has introduced in High Sierra's version of Safari.
You're understanding of cookies is a bit off-target.
Tracking Protection blocks the really odious cookies placed by
cross-site aggregators of information, but it
doesn't block
same-site information gathering.
A cookie manager such as Cookie blocks both.