Hello!
I have recently installed Devuan ASCII, and then upgraded it to Beuwulf altogether. Then I noticed both ASCII and Beowulf come with the same version of Firefox-ESR, with doesn't support some media content I occasionally watch (yeah, the dirty world of DRM, unfortunately), so I figured to install the latest version of proper Firefox, but I wanted to do it with a Devuan package, which is only available from Ceres repos... So I went for pinning, but I a not exactly an expert in it, so I am asking for advice here.

What I did?
I opened /etc/apt/sources.list and added the following line to the end: deb http://pkgmaster.devuan.org/merged ceres main

Then I created /etc/apt/preferences and added this inside:

Package: *
Pin: release n=beowulf
Pin-Priority: 900

Package: *
Pin: release n=ceres
Pin-Priority: -10

I saved the file, and I did a sudo apt update, went well -- no upgrades from ceres were suggested. So I did sudo apt -t ceres install firefox firefox-l10n-hr (the last one is just for localization, of course). Went well, too -- it installed those two single packages from ceres, and forgot about it, as expected.

So, what do I want now?
I would like to be sure my Firefox package will keep being normally upgraded along with the usual upgrades, without me needing to remember to upgrade it individually, and still without automatically pulling anything else from ceres. Is it possible?
Is it possible to pin only the Firefox-related packages, while ignoring the entire rest of the ceres repos?

Thanks in advance for your replies. :-)