Maybe it’s because we are supposed to use containers most of the time… Yesterday, I solved the problem by switching to another Linux distribution. But don’t get me wrong—Fedora is a very good Linux distro, and replacing it isn’t easy. Paradoxically, I now need to work with containers more than I did while I was a Fedora Silverblue user, mixing a stable Debian-based system with a container image of Arch Linux in order to replace the functionality of Fedora Linux.
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It is likely that this issue was a bug on the Atomic Desktops side of things: rpm-ostree upgrade error: File "ac/859321dfe787f24d016e20e585da522713d84edbf0f6fb4e021543ece37264.file to __init__.cpython-312.opt-1.pyc" exists already (stuck on 40.20240822.0) · Issue #590 · fedora-silverblue/issue-tracker · GitHub
The fix has been merged and should land in tomorrow’s update. A “normal” update should work. We’ll see tomorrow.
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Why even have layering then?
Yes, I do. Firefox cannot play some video files, but I am using more librewolf from a flathub and it can play all videos.
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I marked @siosm 's comment as solution, with the assumption that this fixes Silverblue in the given respects.
If this does not solve the issue, let us know ( @rinkeby feel free to change the solution yourself in that case ). Otherwise, I hope we can consider this topic as solved 
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It did solve it. However I did solve it some more by removing unnecessary packages. And I have now a better grasp of these updates 
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I just rebased to Bazzite. Saved Fedora deployment with ostree pin, removed layers, rebased & reinstalled some of the layers.
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For me native Firefox or Firefox from Fedora flatpak can’t play some video files.
What package I need to install?
Some guides on the web are outdated…
some codecs fedora can’t ship because of legal issues, you can download the drivers from rpmfusion or install firefox from flathub flatpak
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You can either install the ffmpeg or the libavcodec-freeworld packages from the rpmfusion repos. Make sure you add the --allowerasing option to the dnf command. Those repos can be configured as shown here.
https://rpmfusion.org/Configuration
The multimedia installation is under the howto tab on the same page.
If this needs further elaboration, please open a new topic. This one is solved, and it also is not about video playback in Firefox.