{
  config,
  pkgs,
  ...
}: let
  lock-false = {
    Value = false;
    Status = "locked";
  };
  lock-true = {
    Value = true;
    Status = "locked";
  };
in {
  home-manager.sharedModules = [
    ./firefox-home.nix
  ];

  programs = {
    firefox = {
      enable = true;
      languagePacks = ["de" "en-US"];

      /*
      ---- POLICIES ----
      */
      # Check about:policies#documentation for options.
      policies = {
        PasswordManagerEnabled = false;
        DisableTelemetry = true;
        DisableFirefoxStudies = true;
        EnableTrackingProtection = {
          Value = true;
          Locked = true;
          Cryptomining = true;
          Fingerprinting = true;
        };
        DisablePocket = true;
        #DisableFirefoxAccounts = true;
        #DisableAccounts = true;
        #DisableFirefoxScreenshots = true;
        OverrideFirstRunPage = "";
        OverridePostUpdatePage = "";
        DontCheckDefaultBrowser = true;
        DisplayBookmarksToolbar = "always"; # alternatives: "always" or "newtab"
        DisplayMenuBar = "default-off"; # alternatives: "always", "never" or "default-on"
        SearchBar = "unified"; # alternative: "separate"

        /*
        ---- EXTENSIONS ----
        */
        # Check about:support for extension/add-on ID strings.
        # Valid strings for installation_mode are "allowed", "blocked",
        # "force_installed" and "normal_installed".

        # How to: https://discourse.nixos.org/t/declare-firefox-extensions-and-settings/36265
        ExtensionSettings = with builtins; let
          extension = shortId: uuid: {
            name = uuid;
            value = {
              install_url = "https://addons.mozilla.org/en-US/firefox/downloads/latest/${shortId}/latest.xpi";
              installation_mode = "normal_installed";
            };
          };
        in
          listToAttrs [
            (extension "ublock-origin" "uBlock0@raymondhill.net")
            (extension "bitwarden-password-manager" "{446900e4-71c2-419f-a6a7-df9c091e268b}")
            #(extension "2fas-two-factor-authentication" "admin@2fas.com")
            (extension "sponsorblock" "sponsorBlocker@ajay.app")
            #(extension "dearrow" "deArrow@ajay.app")
            #(extension "enhancer-for-youtube" "enhancerforyoutube@maximerf.addons.mozilla.org")
            #(extension "tabliss" "extension@tabliss.io")
            #(extension "don-t-fuck-with-paste" "DontFuckWithPaste@raim.ist")
            #(extension "clearurls" "{74145f27-f039-47ce-a470-a662b129930a}")
            #(extension "react-devtools" "@react-devtools")
            (extension "keepa" "amptra@keepa.com")
            (extension "redditUntranslate" "reddit-url-redirector@kichkoupi.com")
            (extension "darkreader" "addon@darkreader.org")
          ];

        /*
        ---- PREFERENCES ----
        */
        # Check about:config for options.
        Preferences = {
          "browser.contentblocking.category" = {
            Value = "strict";
            Status = "locked";
          };
          "extensions.pocket.enabled" = lock-false;
          "extensions.screenshots.disabled" = lock-true;
          "browser.topsites.contile.enabled" = lock-false;
          #"browser.formfill.enable" = lock-false;
          #"browser.search.suggest.enabled" = lock-false;
          #"browser.search.suggest.enabled.private" = lock-false;
          #"browser.urlbar.suggest.searches" = lock-false;
          "browser.urlbar.showSearchSuggestionsFirst" = lock-false;
          "browser.newtabpage.activity-stream.feeds.section.topstories" = lock-false;
          "browser.newtabpage.activity-stream.feeds.snippets" = lock-false;
          "browser.newtabpage.activity-stream.section.highlights.includePocket" = lock-false;
          "browser.newtabpage.activity-stream.section.highlights.includeBookmarks" = lock-false;
          "browser.newtabpage.activity-stream.section.highlights.includeDownloads" = lock-false;
          "browser.newtabpage.activity-stream.section.highlights.includeVisited" = lock-false;
          "browser.newtabpage.activity-stream.showSponsored" = lock-false;
          "browser.newtabpage.activity-stream.system.showSponsored" = lock-false;
          "browser.newtabpage.activity-stream.showSponsoredTopSites" = lock-false;
        };
      };
    };
  };
}