update firefox config to automatically apply gnome theme

machines/kitchen/configuration.nix

@@ -26,8 +26,6 @@
 	environment.systemPackages = with pkgs; [
 		wget
 		micro
-		firefox
-		chromium
 		gnome.gnome-tweaks
 	];
 

user/environments/nixos/home.nix

@@ -1,8 +1,8 @@
 { config, pkgs, ... }:
-
 {
 	imports = [
 		../../modules/dev.nix
+		../../modules/firefox.nix
 		../../modules/fonts.nix
 		../../modules/git.nix
 		../../modules/git_nixos.nix
@@ -11,10 +11,5 @@
 		../../modules/zsh.nix
 	];
   
-	home.packages = with pkgs; [
-		firefox
-		# foxitreader
-	];
-  
 	home.stateVersion = "21.05";
 }

user/modules/firefox.nix

@@ -0,0 +1,30 @@
+{ pkgs, ... }:
+{
+  # Add Firefox GNOME theme directory
+  home.file."firefox-gnome-theme" = {
+    target = ".mozilla/firefox/default/chrome/firefox-gnome-theme";
+    source = pkgs.fetchFromGitHub {
+      owner = "rafaelmardojai";
+      repo = "firefox-gnome-theme";
+      rev = "v110";
+      hash = "sha256-2KKntUo0uYCXZrnaB5Q7bf97+tUL3UiuyDtTlyjbXFo=";
+    };
+  };
+
+  programs.firefox = {
+    enable = true;
+    profiles.default = {
+      name = "Default";
+      settings = {
+        # For Firefox GNOME theme:
+        "toolkit.legacyUserProfileCustomizations.stylesheets" = true;
+        "browser.tabs.drawInTitlebar" = true;
+        "svg.context-properties.content.enabled" = true;
+      };
+      userChrome = ''
+        @import "firefox-gnome-theme/userChrome.css";
+        @import "firefox-gnome-theme/theme/colors/dark.css"; 
+      '';
+    };
+  };
+}