{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 = "v126";
      hash = "sha256-jVbj2JD5GRkP8s3vKBtd9PDpftf3kjLR0ZA/ND/c2+Q=";
    };
  };

  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";
      '';
    };
  };
}