{
  inputs,
  outputs,
  config,
  pkgs,
  ...
}:
with inputs; {
  home.sessionVariables.DEFAULT_BROWSER = "${pkgs.firefox}/bin/firefox";

  programs.firefox = {
    enable = true;
    package =
      pkgs.firefox.override {cfg = {enableGnomeExtensions = true;};};
    profiles.xqtc = {
      isDefault = true;
      extensions = with inputs.firefox-addons.packages.${pkgs.system}; [
        ublock-origin
        bitwarden
        sidebery
        leechblock-ng
        darkreader
        stylus
        vimium-c
        noscript
      ];
      search = {
        default = "SearX";
        force = true;
        engines = {
          "SearX" = {
            urls = [
              {
                template = "https://searx.org/search";
                params = [
                  {
                    name = "q";
                    value = "{searchTerms}";
                  }
                ];
              }
            ];
          };
          "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"];
          };
          "Nix 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://nixos.wiki/index.php?search={searchTerms}";
              }
            ];
            iconUpdateURL = "https://nixos.wiki/favicon.png";
            updateInterval = 24 * 60 * 60 * 1000; # every day
            definedAliases = ["@nw"];
          };

          "Bing".metaData.hidden = true;
          "Google".metaData.hidden = true;
          "DuckDuckGo".metaData.alias = "@ddg";
        };
      };
      settings = {
        "app.normandy.first_run" = false;
        "app.shield.optoutstudies.enabled" = false;
        "privacy.donotttrackheader.enabled" = true;
        "browser.startup.homepage" = "https://xqtc161.github.io";
        "browser.search.region" = "DE";
        "browser.search.isUS" = false;
        "browser.theme.content-theme" = "0";
        "browser.theme.toolbar-theme" = "0";
        "browser.newtabpage.activity-stream.showSponsored" = false;
        "browser.newtabpage.activity-stream.showSponsoredTopSites" = false;
        "services.sync.prefs.sync.browser.newtabpage.activity-stream.showSponsored" =
          false;
        "services.sync.prefs.sync.browser.newtabpage.activity-stream.showSponsoredTopSites" =
          false;
        "browser.toolbars.bookmarks.visibility" = "never";
        "general.useragent.locale" = "de-DE";
        "distribution.searchplugins.defaultLocale" = "de-DE";
        "signon.rememberSignons" = false;
        "toolkit.legacyUserProfileCustomizations.stylesheets" =
          true; # Needed to allow userChrome.css
      };
      userChrome = ''
        @import "firefox-gnome-theme/userChrome.css";
               #TabsToolbar {
                 display: none; !important
               }
               #sidebar-header {
                 display: none;
               }
      '';
    };
  };
}