For the Flatpak version of Firefox the Profile Directory shown on about:support doesn't exist.
The correct place to put user.js is
$HOME/.var/app/org.mozilla.firefox/.mozilla/firefox/<profile name>/
Tested on AuroraOS (uBlue)
I couldn't see this mentioned anywhere. If it is then feel free to close issue.
Otherwise it might be helpful to add it here https://github.com/yokoffing/Betterfox/wiki/Backup
For the Flatpak version of Firefox the
Profile Directoryshown onabout:supportdoesn't exist.The correct place to put user.js is
$HOME/.var/app/org.mozilla.firefox/.mozilla/firefox/<profile name>/Tested on AuroraOS (uBlue)
I couldn't see this mentioned anywhere. If it is then feel free to close issue.
Otherwise it might be helpful to add it here https://github.com/yokoffing/Betterfox/wiki/Backup