Pop-up exceptions disappear once Fx is close in Windows 11

Hi. Recently, not sure of which version as there seems to be a lot of updates :) I'm currently on 152.0.1 on a Windows 11. This problem doesn't happen on my Raspberry pi with 152.0 (aarch64) On my Android 13 I have allowed Pop-ups, via about:config, sort of, but there is no option to make Exceptions So back to Windows 11. As said I can enter an exception and that works when I load the site I want until I close Fx and I have to do it all again: Enter Domain : Allow : Save etc. Once, and only once, I closed the [settings] and I'm sure after closing FX and opening it worked fine. Just closed again and problem has occurred. The issue arises on my site https://calstock.org.uk which opens a window to a UK weather site, The Met Office. It requires cookies etc. and shows it's own popup. What I do is open it first in a new window, which is the popup I am referring to, then I load it in an iframe, then I close the popup. That way the cookie is set by the new window that pops up so there is no query on my main page. I only have the one extension, uBlock Origin which I have on all devices Thanks