I was a huge fan too. I had a lot of containers set up on three different machines and they all got wiped out last week. I haven't put in all the work to rebuild them yet and I'm losing the wherewithal to keep putting up with Firefox.
Containers are okay, but, I wish they had their own database for things like saved passwords and addresses. I still end up using a separate profile for work, because I don't want _anything_ from work on my personal profile. Although, if entire container profiles can disappear with an update, that could be even more of a hassle.
To be clear though, FPI is the real weapon here against things like Facebook tracking.