- In practice, how well does sudo steamos-readonly disable and installing things from pacman work out for you? In particular, I want to use PWAs For Firefox and it requires this package in order to work. Do packages actually get wiped with SteamOS updates, as the FAQ warns?
As far as I know, a new update of SteamOS will revert these changes back. However Steam has builtin support for Nix package system, where you don't need to disable readonly filesystem and changes to this directory / package system stays intact even after an update. Two articles explaining how to do this at https://sadatdaniel.dev/2023/11/install-nix-package-manager-on-your-steam-deck/ (2023) and https://chrastecky.dev/gaming/persistent-packages-on-steam-deck-using-nix (2025). Check if a certain package is available under https://search.nixos.org/packages . Now, I never did that, as I never had a need for. I can't say if this helps you with the specific package, but it might be useful for you to look into this.