I want to edit mozilla file, but which one and should i delete /etc/apt/preferences.d/preferences.d/ since it does not seem to contain any non duplicate file. Should this be reported to developers Development - KDE Discuss?
UPDATE:
It appears that the change of a file in a subdirectory: /etc/apt/preferences.d/preferences.d/org-kde-neon-packages-mozilla-org-pin
namely Pin-Priority line, does NOT reflect in apt-cache policy firefox command output, but changing file in parent directory: /etc/apt/preferences.d/org-kde-neon-packages-mozilla-org-pin
makes a difference.
Furthermore moving away file that makes difference still does not take “subdirectory” file into account (at least regarding Pin-Priority).
So that is an indicator of a directory being obsolete/erroneously placed.
I think the extra directory and files are an error/mistake/bug. They are identical to the files in the correct and expected location but aren’t affecting anything as far as I can see.