{
  lib,
  config,
  ...
}:

let
  name = "browsers";
  cfg = config.nixowos.defaults.${name};
in
{
  options.nixowos.defaults.${name} = {
    enable = lib.mkEnableOption name;
  };

  config = lib.mkIf cfg.enable {
    programs.firefox = lib.mkDefault {
      policies = {
        ExtensionSettings =
          let
            # source: https://discourse.nixos.org/t/declare-firefox-extensions-and-settings/36265/17
            extension = shortId: uuid: {
              name = uuid;
              value = {
                install_url = "https://addons.mozilla.org/en-US/firefox/downloads/latest/${shortId}/latest.xpi";
                installation_mode = "normal_installed";
              };
            };
          in
          builtins.listToAttrs [
            (extension "ublock-origin" "uBlock0@raymondhill.net")
            (extension "black21" "{9b84b6b4-07c4-4b4b-ba21-394d86f6e9ee}")
          ];

        Preferences = {
          "browser.newtabpage.activity-stream.feeds.wallpaperfeed".Value = false;
          "browser.newtabpage.activity-stream.feeds.weatherfeed".Value = false;

          # source: https://discourse.nixos.org/t/declare-firefox-extensions-and-settings/36265
          "browser.newtabpage.activity-stream.feeds.section.topstories".Value = false;
          "browser.newtabpage.activity-stream.feeds.snippets".Value = false;
          "browser.newtabpage.activity-stream.section.highlights.includePocket".Value = false;
          "browser.newtabpage.activity-stream.section.highlights.includeBookmarks".Value = false;
          "browser.newtabpage.activity-stream.section.highlights.includeDownloads".Value = false;
          "browser.newtabpage.activity-stream.section.highlights.includeVisited".Value = false;
          "browser.newtabpage.activity-stream.showSponsored".Value = false;
          "browser.newtabpage.activity-stream.system.showSponsored".Value = false;
          "browser.newtabpage.activity-stream.showSponsoredTopSites".Value = false;

          "browser.newtabpage.activity-stream.showSearch".Value = false;
          "browser.newtabpage.activity-stream.feeds.topsites".Value = false;
          "browser.newtabpage.activity-stream.showWeather".Value = false;
        };

        SearchEngines = {
          Add = [
            # source: https://discourse.nixos.org/t/declare-firefox-extensions-and-settings/36265/33
            {
              Alias = "@np";
              IconURL = "https://nixos.org/favicon.png";
              Method = "GET";
              Name = "NixOS Packages";
              URLTemplate = "https://search.nixos.org/packages?from=0&size=200&sort=relevance&type=packages&query={searchTerms}";
            }
            {
              Alias = "@no";
              IconURL = "https://nixos.org/favicon.png";
              Method = "GET";
              Name = "NixOS Options";
              URLTemplate = "https://search.nixos.org/options?from=0&size=200&sort=relevance&type=packages&query={searchTerms}";
            }
          ];
        };
      };
    };
  };
}