From 1f49f1d63e64214176a324c3abe941558f1c3aba Mon Sep 17 00:00:00 2001
From: alexion <contact@alexion.dev>
Date: Sat, 5 Sep 2026 07:35:30 -0400
Subject: [PATCH] fix(nixos): make Firefox scale host-specific

---
 configs/nixos/hosts/neogaia/default.nix        |  1 +
 configs/nixos/modules/desktop/apps/firefox.nix | 16 ++++++++++++++--
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/configs/nixos/hosts/neogaia/default.nix b/configs/nixos/hosts/neogaia/default.nix
index 0e8e8a9..0bdf539 100644
--- a/configs/nixos/hosts/neogaia/default.nix
+++ b/configs/nixos/hosts/neogaia/default.nix
@@ -46,6 +46,7 @@
   modules.shell.pi.enable = true;
 
   modules.desktop.enable = true;
+  modules.desktop.apps.firefox.uiScale = "1.25";
   modules.desktop.apps.obsidian.enable = true;
   modules.desktop.apps.steam.enable = true;
 
diff --git a/configs/nixos/modules/desktop/apps/firefox.nix b/configs/nixos/modules/desktop/apps/firefox.nix
index 801ecbc..d47e3bd 100644
--- a/configs/nixos/modules/desktop/apps/firefox.nix
+++ b/configs/nixos/modules/desktop/apps/firefox.nix
@@ -12,7 +12,19 @@ let
   firefoxAddons = inputs.firefox-addons.packages.${pkgs.stdenv.hostPlatform.system};
 in
 {
-  options.modules.desktop.apps.firefox.enable = lib.mkEnableOption "Firefox as the desktop browser";
+  options.modules.desktop.apps.firefox = {
+    enable = lib.mkEnableOption "Firefox as the desktop browser";
+
+    uiScale = lib.mkOption {
+      type = lib.types.str;
+      default = "1.0";
+      description = ''
+        Firefox UI and page scale, passed to `layout.css.devPixelsPerPx`.
+        Override it on hosts that need a larger browser scale, such as small
+        high-DPI laptop panels.
+      '';
+    };
+  };
 
   config = lib.mkIf cfg.enable {
     home-manager.users.${user} = hm: {
@@ -70,7 +82,7 @@ in
             # whole chrome while point-sized apps stay put.
             # A shade under that brings it into line without dropping to true
             # 1:1, which reads too small at this DPI.
-            "layout.css.devPixelsPerPx" = "1.25";
+            "layout.css.devPixelsPerPx" = cfg.uiScale;
 
             # Auto-enable the sideloaded Firefox Color add-on carrying the Nord
             # chrome theme, which Firefox otherwise leaves disabled.