{ config
, lib
, pkgs
, ...
}: {
  programs.firefox = {
    enable = true;
    package = pkgs.firefox;

    profiles = {
      default = {
        isDefault = true;

        settings = {
          # Extensions are managed with Nix, so don't update.
          "extensions.update.autoUpdateDefault" = false;
          "extensions.update.enabled" = false;

          # Sync
          # "services.sync.username" = config.etu.user.email;

          "services.sync.engine.addons" = false; # Do not sync extensions.

          "general.autoScroll" = true; # Middle click to scroll

          "browser.startup.page" = 3; # Restore previous windows and tabs.

          # Privacy enhancements
          "browser.newtabpage.activity-stream.feeds.telemetry" = false;
          "browser.newtabpage.activity-stream.telemetry" = false;
          "browser.newtabpage.activity-stream.feeds.snippets" = false;
          "browser.newtabpage.activity-stream.feeds.section.topstories" = false;
          "browser.newtabpage.activity-stream.section.highlights.includePocket" = false;
          "browser.newtabpage.activity-stream.showSponsored" = false;
          "browser.newtabpage.activity-stream.feeds.discoverystreamfeed" = false;
          "browser.newtabpage.activity-stream.showSponsoredTopSites" = false;

          # Improve performance
          "gfx.webrender.all" = true;

          # Do Not Track header
          "privacy.donottrackheader.enabled" = true;
          "privacy.donottrackheader.value" = 1;

          # Enable userChrome customisations
          # "toolkit.legacyUserProfileCustomizations.stylesheets" = true;
        };

        extensions = with config.nur.repos.rycee.firefox-addons; [
          bitwarden
          clearurls
          consent-o-matic
          darkreader
          dearrow
          deutsch-de-language-pack
          dictionary-german
          flagfox
          ipvfoo
          leechblock-ng
          localcdn
          plasma-integration
          privacy-badger
          rust-search-extension
          sidebery
          skip-redirect
          sponsorblock
          tab-stash
          ublock-origin
          unpaywall
        ];

        search = {
          force = true;
          default = "DuckDuckGo";
          order = [ "DuckDuckGo" "Nix Packages" "Nix Options" "NixOS Wiki" ];

          engines = {
            "DuckDuckGo".metaData = {
              alias = "@ddg";
            };
            "Nix Packages" = {
              urls = [
                {
                  template = "https://search.nixos.org/packages";
                  params = [
                    {
                      name = "type";
                      value = "packages";
                    }
                    {
                      name = "query";
                      value = "{searchTerms}";
                    }
                  ];
                }
              ];

              icon = "/run/current-system/sw/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 = "/run/current-system/sw/share/icons/hicolor/scalable/apps/nix-snowflake.svg";

              definedAliases = [ "@no" ];
            };
            "Home-Manager Options" = {
              urls = [
                {
                  template = "https://mipmip.github.io/home-manager-option-search";
                  params = [
                    {
                      name = "query";
                      value = "{searchTerms}";
                    }
                  ];
                }
              ];

              icon = "/run/current-system/sw/share/icons/hicolor/scalable/apps/nix-snowflake.svg";

              definedAliases = [ "@ho" ];
            };

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

            "Bing".metaData.hidden = true;
            "Amazon.de".metaData.hidden = true;
            "Google".metaData = {
              alias = "@g";
              hidden = true;
            };
          };
        };

        bookmarks = [
          {
            toolbar = true;
            bookmarks = [
              {
                name = "Home Manager";
                url = "https://nixos.wiki/wiki/Home_Manager";
              }
            ];
          }
          {
            name = "wikipedia";
            tags = [ "wiki" ];
            keyword = "wiki";
            url = "https://en.wikipedia.org/wiki/Special:Search?search=%s&go=Go";
          }
          {
            name = "kernel.org";
            url = "https://www.kernel.org";
          }
          {
            name = "Nix sites";
            bookmarks = [
              {
                name = "homepage";
                url = "https://nixos.org/";
              }
              {
                name = "wiki";
                tags = [ "wiki" "nix" ];
                url = "https://nixos.wiki/";
              }
              {
                name = "Nix sites";
                bookmarks = [
                  {
                    name = "homepage";
                    url = "https://nixos.org/";
                  }
                  {
                    name = "wiki";
                    url = "https://nixos.wiki/";
                  }
                ];
              }
            ];
          }
        ];
      };
    };
  };

  home.sessionVariables = {
    BROWSER = "firefox";
    MOZ_USE_XINPUT2 = "1";
    MOZ_ENABLE_WAYLAND = "1";
  };
}