steam-frame/lhns--steam-frame-nix
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firefox: prefs option (about:config values for every profile)

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Pierre Kisters committed 2026-09-28 05:19:57 +02:00
1 parent 4e14863277
commit d027502445
1 file changed
+31 -12
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modules/firefox.nix
+31 -12
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@@ -5,19 +5,25 @@
# readable at eval time, so user.js is linked into each profile on switch.
# - desktopProfile: the sessions have separate buses/displays, so a second
# Firefox can't reach the running one and hits the profile lock; the nested
# desktop gets its own profile (no user.js: fullscreen works there).
# desktop gets its own profile (no fullscreen fix: fullscreen works there).
# - prefs: about:config values for every profile, desktop one included.
# The entry shadows the Flatpak's (same ID), keeping MIME associations, and is
# seen by the "+" menu (which reads only ~/.local/share/applications).
{ config, pkgs, lib, ... }:
let
cfg = config.steamFrame.firefox;
userJs = pkgs.writeText "firefox-user.js" ''
user_pref("full-screen-api.ignore-widgets", true);
'';
toUserJs = name: prefs: pkgs.writeText name (lib.concatStrings (lib.mapAttrsToList
(k: v: "user_pref(${builtins.toJSON k}, ${builtins.toJSON v});\n") prefs));
vrPrefs = cfg.prefs // lib.optionalAttrs cfg.vrFullscreenFix { "full-screen-api.ignore-widgets" = true; };
userJs = toUserJs "firefox-user.js" vrPrefs;
desktopUserJs = toUserJs "firefox-desktop-user.js" cfg.prefs;
ffDir = "$HOME/.var/app/org.mozilla.firefox/config/mozilla/firefox";
profileDir = "${ffDir}/${cfg.desktopProfile}";
skipDesktopProfile = lib.optionalString (cfg.desktopProfile != null)
''[ "$(basename "$prof")" = ${lib.escapeShellArg cfg.desktopProfile} ] && continue'';
# user.js for a profile dir ($prof): desktop profile -> prefs only.
pickUserJs = if cfg.desktopProfile == null then "js=${userJs}" else ''
js=${userJs}
[ "$(basename "$prof")" = ${lib.escapeShellArg cfg.desktopProfile} ] && js=${desktopUserJs}
'';
firefox = pkgs.writeShellScript "firefox-launcher" (''
profile=()
@@ -40,9 +46,20 @@ in {
type = lib.types.bool;
default = true;
description = ''
Link a user.js (full-screen-api.ignore-widgets) into every existing
profile except the desktop one, so fullscreen fills the window instead
of freezing in the Steam session.
Set full-screen-api.ignore-widgets in every profile except the
desktop one, so fullscreen fills the window instead of freezing in the
Steam session.
'';
};
prefs = lib.mkOption {
type = with lib.types; attrsOf (oneOf [ bool int str ]);
default = { };
example = { "media.av1.enabled" = false; };
description = ''
about:config preferences for every profile (desktop one included),
set through a linked user.js on each switch. E.g. media.av1.enabled =
false: the Frame's decoder has no AV1, so sites like YouTube fall back
to VP9/H.264, which it decodes in hardware.
'';
};
desktopProfile = lib.mkOption {
@@ -56,17 +73,19 @@ in {
};
config = lib.mkIf cfg.enable {
home.activation.firefoxUserJs = lib.mkIf cfg.vrFullscreenFix
# Linked into every existing profile (profile names are random); an empty
# user.js is harmless and keeps turning prefs off revertible.
home.activation.firefoxUserJs =
(lib.hm.dag.entryAfter [ "writeBoundary" ] ''
for prof in "${ffDir}"/*/; do
${skipDesktopProfile}
[ -f "$prof/prefs.js" ] || continue # only real profiles
${pickUserJs}
target="$prof/user.js"
if [ -e "$target" ] && [ ! -L "$target" ]; then
echo "firefox: skipping $target (not managed by us, move it away to adopt)"
continue
fi
run ln -sfn ${userJs} "$target"
run ln -sfn "$js" "$target"
done
'');