Wish: saving multi window session in ONE entry

[cheesecracker]

Suppose I have three Firefox windows, each containing some tabs. If I press the "Save session" button, I will have three entries, like this:

7/26/2022, 7:09:23 PM #1 7/26/2022, 7:09:23 PM #2 7/26/2022, 7:09:23 PM #3

It would be nice if all the windows are saved in ONE unique entry.