Avoid macos in firefox activations

home-manager/common.nix

@@ -16,7 +16,6 @@
     ./ssh.nix
     ./git.nix
     ./editor.nix
-    ./browser.nix
     ./darwin.nix
   ];
 

home-manager/firefox.nix

@@ -0,0 +1,31 @@
+{ lib, pkgs, ... }:
+
+lib.mkMerge [
+  # Firefox package does not support both M1 and Intel like x86_64-apple-darwin
+  (lib.mkIf pkgs.stdenv.isLinux {
+    # https://github.com/nix-community/home-manager/blob/release-24.05/modules/programs/firefox.nix
+    programs.firefox = {
+      enable = true;
+      profiles.default = {
+        isDefault = true;
+        settings = {
+          # UI lang
+          "intl.locale.requested" = "ja";
+
+          "browser.shell.checkDefaultBrowser" = false;
+
+          # Required for playing DRM contents as Spotify
+          "media.eme.enabled" = true;
+
+          # Enabling userChrome.css
+          "toolkit.legacyUserProfileCustomizations.stylesheets" = true;
+
+          # Disabling alt+ keybinds for lanchers
+          # https://www.reddit.com/r/firefox/comments/129w85w/is_there_a_way_to_disable_firefox_alt_keyboard/
+          "ui.key.menuAccessKeyFocuses" = false;
+        };
+        userChrome = builtins.readFile ../config/Firefox/userChrome.css;
+      };
+    };
+  })
+]