Comment by WorldMaker

This has been one of my use cases for the Multi-Account Containers extension for some time now. It's actually such a motivating use case that one of Firefox explorations into a "simpler" focused UX alternative to the Multi-Account Container extension is called "Facebook Container" and does only that, isolate Facebook, specifically into its own Container.

As noted, it can't defeat all forms of device fingerprinting, but it does defeat cookie tracking.