So... Is the update for Quantum ever going to happen?

[jpcst]

Has Mozilla given any attention to this so the devs can have the necessary tools?

[Infocatcher]

Unfortunately no, still no API, see https://github.com/Infocatcher/Private_Tab_WE#issues

[jpcst]

I've seen some people using Temporary Container as an alternative.
If you know how it works, I have the "Deletes History Temporary Containers" advanced settings on, but it doensn't seen to work. Maybe you could help me?