Can't honestly say how well facebook container works but i think i get fewer suggested pages, ads, etc (though I have a number of anti-ad solutions in place, aside from FB container).
I've only given the extension 3 stars though because it was listed as available on FF android and installed fine too, before the recent update to 68.2.0.
Now i find the "about this extension" detail says it doesn't work on FF android. Yet it did and was available from the app add-on list. Didn't seem to cause any issues either on FF android.