A facebook employee explained me how tracking works. Its not the email address Meta is concerned about. Its the IP, device identifiers and location. Meta doesnt care about the email at all apart from sending you emails for notification. Even with a fake email they exactly know who you are. Let’s say you visit CNN.com which has facebook tracker. Facebook has the IP and the device identifiers. Now you login with fake email account on Instagram, facebook knows that’s the IP ans the same device hence it “must” be the same person That’s how facebook creates shadow profiles.
And FF containers are still no match for advanced fingerprinting.
The only way to protect against advanced fingerprinting is to use the TOR Browser or Mullvad Browser, to blend in with everyone else who shares the exact same fingerprint using those tools. The best you can do outside of those is to protect against less advanced scripts.
that is much more complex for normal people but yeah. tor can be slow as shit especially.
Tor is also not recommended for streaming since the p2p connection bypasses the Tor network