{ buildFirefoxXpiAddon, fetchurl, lib, stdenv }:
  {
    "600-sound-volume" = buildFirefoxXpiAddon {
      pname = "600-sound-volume";
      version = "1.5.3";
      addonId = "{c4b582ec-4343-438c-bda2-2f691c16c262}";
      url = "https://addons.mozilla.org/firefox/downloads/file/4133303/600_sound_volume-1.5.3.xpi";
      sha256 = "7045a812608338f95181459ae3e518bb51c8dc9a724a4083afb687d14075c304";
      meta = with lib;
      {
        homepage = "http://resourcefulman.net/";
        description = "Up to 600% volume boost";
        license = licenses.mpl20;
        mozPermissions = [ "<all_urls>" "tabs" "activeTab" "storage" ];
        platforms = platforms.all;
        };
      };
    "checkmarks-web-ext" = buildFirefoxXpiAddon {
      pname = "checkmarks-web-ext";
      version = "1.6.1";
      addonId = "{bd97f89b-17ba-4539-9fec-06852d07f917}";
      url = "https://addons.mozilla.org/firefox/downloads/file/3594420/checkmarks_web_ext-1.6.1.xpi";
      sha256 = "c3ccf4b302ee96c9b883c4a1f7d26395ab4e276b976cab2d65c9cd898964e4f0";
      meta = with lib;
      {
        homepage = "https://github.com/tanwald/checkmarks";
        description = "Checks, sorts, formats bookmarks and loads favicons.";
        license = licenses.gpl3;
        mozPermissions = [
          "<all_urls>"
          "bookmarks"
          "browsingData"
          "storage"
          "tabs"
          "webNavigation"
          "webRequest"
          "webRequestBlocking"
          ];
        platforms = platforms.all;
        };
      };
    "google-container" = buildFirefoxXpiAddon {
      pname = "google-container";
      version = "1.5.4";
      addonId = "@contain-google";
      url = "https://addons.mozilla.org/firefox/downloads/file/3736912/google_container-1.5.4.xpi";
      sha256 = "47a7c0e85468332a0d949928d8b74376192cde4abaa14280002b3aca4ec814d0";
      meta = with lib;
      {
        homepage = "https://github.com/containers-everywhere/contain-google";
        description = "THIS IS NOT AN OFFICIAL ADDON FROM MOZILLA!\nIt is a fork of the Facebook Container addon.\n\nPrevent Google from tracking you around the web. The Google Container extension helps you take control and isolate your web activity from Google.";
        license = licenses.mpl20;
        mozPermissions = [
          "<all_urls>"
          "contextualIdentities"
          "cookies"
          "management"
          "tabs"
          "webRequestBlocking"
          "webRequest"
          "storage"
          ];
        platforms = platforms.all;
        };
      };
    "opera-gx-witchcraft-purple" = buildFirefoxXpiAddon {
      pname = "opera-gx-witchcraft-purple";
      version = "2.0";
      addonId = "{bf197856-a3c2-4280-84c5-9b556379b706}";
      url = "https://addons.mozilla.org/firefox/downloads/file/3522842/opera_gx_witchcraft_purple-2.0.xpi";
      sha256 = "aa3c6377b8571c42a3988de042694be70ec6a250a9aea7ae1cc262acdc9374eb";
      meta = with lib;
      {
        description = "inspired by Opera GX";
        license = licenses.cc-by-sa-30;
        mozPermissions = [];
        platforms = platforms.all;
        };
      };
    "ttv-lol-pro" = buildFirefoxXpiAddon {
      pname = "ttv-lol-pro";
      version = "2.2.1";
      addonId = "{76ef94a4-e3d0-4c6f-961a-d38a429a332b}";
      url = "https://addons.mozilla.org/firefox/downloads/file/4179399/ttv_lol_pro-2.2.1.xpi";
      sha256 = "83d012878021fb5fe25bee1101a7a760974ae9e2949b80fd99b73d3da48b1f99";
      meta = with lib;
      {
        homepage = "https://github.com/younesaassila/ttv-lol-pro";
        description = "TTV LOL PRO removes most livestream ads from Twitch.";
        license = licenses.gpl3;
        mozPermissions = [
          "proxy"
          "storage"
          "webRequest"
          "webRequestBlocking"
          "https://*.ttvnw.net/*"
          "https://*.twitch.tv/*"
          "https://perfprod.com/ttvlolpro/telemetry"
          "https://www.twitch.tv/*"
          "https://m.twitch.tv/*"
          ];
        platforms = platforms.all;
        };
      };
    }