{ inputs, config, pkgs, theme, lib, ... }: {

  # home.file.".mozilla/firefox/nix-user-profile/chrome/firefox-gnome-theme".source = inputs.firefox-gnome-theme;

  programs.firefox = {
    enable = true;

    profiles.default = {
      isDefault = true;
      name = "default";
      # userChrome =  ''@import "firefox-gnome-theme/userChrome.css";'';
      # userContent = ''@import "firefox-gnome-theme/userContent.css";'';

      # https://discourse.nixos.org/t/anyone-using-firefox-gnome-theme-successfully-with-nixos-home-manager/19248/3
      settings = {
        ## Firefox gnome theme ## - https://github.com/rafaelmardojai/firefox-gnome-theme/blob/7cba78f5216403c4d2babb278ff9cc58bcb3ea66/configuration/user.js
        # (copied into here because home-manager already writes to user.js)
        "toolkit.legacyUserProfileCustomizations.stylesheets" = true; # Enable customChrome.cs
        "browser.uidensity" = 0; # Set UI density to normal
        "svg.context-properties.content.enabled" = true; # Enable SVG context-propertes
        "browser.theme.dark-private-windows" = false; # Disable private window dark theme
      };

      # https://nur.nix-community.org/repos/rycee/
      extensions =  with pkgs.nur.repos; [
        rycee.firefox-addons.darkreader
        rycee.firefox-addons.ublock-origin
        rycee.firefox-addons.privacy-redirect
        rycee.firefox-addons.link-cleaner
        rycee.firefox-addons.adnauseam
        rycee.firefox-addons.sponsorblock
      ];

      search.default = "Ecosia";
      search.force = true;
      search.order = [ "Ecosia" ];
      search.engines = {
        "Ecosia" = {
          urls = [{
            template = "https://www.ecosia.org/search";
            params = [
              { name = "method"; value = "index"; }
              { name = "q"; value = "{searchTerms}"; }
            ];
          }];
          definedAliases = [ "@ec" ];
        };
        "Nix Packages" = {
          urls = [{
            template = "https://search.nixos.org/packages";
            params = [
              { name = "type"; value = "packages"; }
              { name = "query"; value = "{searchTerms}"; }
            ];
          }];
          icon = "${pkgs.nixos-icons}/share/icons/hicolor/scalable/apps/nix-snowflake.svg";
          definedAliases = [ "@np" ];
        };

        "NixOS Options" = {
          urls = [{
            template = "https://search.nixos.org/options";
            params = [
              { name = "type"; value = "options"; }
              { name = "query"; value = "{searchTerms}"; }
            ];
          }];
          icon = "${pkgs.nixos-icons}/share/icons/hicolor/scalable/apps/nix-snowflake.svg";
          definedAliases = [ "@no" ];
        };

        "NixOS Wiki" = {
          urls = [{ template = "https://wiki.nixos.org/w/index.php?search={searchTerms}"; }];
          iconUpdateURL = "https://wiki.nixos.org/favicon.png";
          updateInterval = 24 * 60 * 60 * 1000; # every day
          definedAliases = [ "@nw" ];
        };

        "Home Manager Options" = {
          urls = [{ template = "https://home-manager-options.extranix.com/?query={searchTerms}&release=master"; }];
          icon = "${pkgs.nixos-icons}/share/icons/hicolor/scalable/apps/nix-snowflake.svg";
          definedAliases = [ "@hm" ];
        };
      };
      extraConfig =  builtins.readFile ./firefox/arkenfox-user.js;
    };
  };
}