Alternative to TabCloud in FF Quantum (Session manager)

I've recently switched from Chrome to FF Quantum and was using an extension called TabCloud in the former which also worked on FF. Since the switch though said addon is no longer supported and I'm looking for a replacement with the same functionality.

Basically I just want something that can let me save a single window that have open in FF, rename if desired and then access it whenever I want.

I have tried Tab session manager except it doesn't let me pick what to save, but rather it just saves the whole session so I end up with several windows and tabs I don't want.

Thanks