Flatpak permission "host folders" missing, but profile stored in host folder

The flathub firefox stores its profile under `~/.var/app/org.mozilla.firefox/.mozilla/`. This works perfectly even without any /home access.

Librewolf stores all profiles temporarily and is not able to save them permanently, as the permission is missing.

This is extremely confusing.

## Solution 1
Just grant access to /home folder. This increases some attack surface though

## Solution 2
Move the profile to the flatpaks `~/.var/app/` location. This works out of the box with no permissions.

## Solution 3
Some mount-bind manual stuff

## Solution 4
Implement a dialog on startup, to request the user to open that location through a portal and bind it to the flatpak folder. This is not easy to implement I guess.

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On Linux you can just create symlinks for folders with strange locations. Also Librewolf has the really awesome GUI settings to access that.