Wasn't specifically referring to Firefox, didn't intend to imply that - I have not even used the flatpak version. It was a general comment that is not specific

Wasn't specifically referring to Firefox, didn't intend to imply that - I have not even used the flatpak version. It was a general comment that is not specific to Flatpak - it will a problem for any cross-distro packaging. (Heck, plenty of developers mess up native packaging for distros they're not familiar with.)