Facebook container extension
No, that's not the same thing AT ALL. All it does is "log you out of Facebook and delete Facebook cookies". I hardly ever login to Facebook on my browser and when I do I always use a private window to avoid its cookies leaking out to my regular browsing sessions. This extension would do fuck all for me, and it sounds like this is an extension - not even part of Firefox.
That extension does NOTHING to prevent Facebook using their 'like' buttons that are ubiquitous on web sites all over the internet from tracking you, which they do even if you don't click on them. That's what Apple is trying to attack here, and Firefox is doing ZERO to prevent that. Maybe there are some third party extensions to do this, but this should be built into the browser for Facebook, Google and Amazon, and you should be able to add other websites to that list if you so choose.