{ pkgs, ... }:
let
  # Concatenate all files in the `./usercss` directory into one string
  css-files = map (n: ./usercss/${n}) (builtins.attrNames (builtins.readDir ./usercss));
  userChrome = builtins.concatStringsSep "\n" (map builtins.readFile css-files);
in
{
  home.sessionVariables.BROWSER = "firefox";

  programs.firefox = {
    profiles = {
      alice = {
        name = "alice";
        isDefault = true;
        inherit userChrome;

        search = {
          default = "DuckDuckGo";
          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;
            # builtin engines only support specifying one additional alias
            "Google".medaData.alias = "@g";
          };
        }; # end of search

        settings = {
          "browser.compactmode.show" = true;
          "toolkit.legacyUserProfileCustomizations.stylesheets" = true;
        };
      }; # end of alice (profile)
    }; # end of profiles
  };
}