{ inputs, outputs, config, pkgs, ... }: {

  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
        darkreader
        noscript
      ];
      search = {
        default = "DuckDuckGo";
        force = true;
        engines = {
          "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 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://start.duckduckgo.com";
        "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 = ''
        #TabsToolbar {
          display: none; !important
        }
        #sidebar-header {
          display: none;
        }
      '';
    };
  };
}