{
  pkgs,
  ...
}:
let
  arkenfox = builtins.readFile "${pkgs.personal.static.userjs.arkenfox}";
  default =
    arkenfox
    + pkgs.lib.personal.toUserJS {
      "signon.rememberSignons" = false; # 0901
      "security.nocertdb" = true; # 1222
      "media.peerconnection.enabled" = false; # 2001
      "media.peerconnection.ice.no_host" = true; # 2004
      "dom.allow_cut_copy" = true; # 2404
      "dom.battery.enabled" = false; # 2502
      "permissions.default.xr" = 2; # 2521
      "browser.search.separatePrivateDefault" = false; # 0830
      "browser.search.separatePrivateDefault.ui.enabled" = false; # 0830
      "privacy.clearOnShutdown_v2.historyFormDataAndDownloads" = true; # 2811
      "privacy.clearOnShutdown_v2.browsingHistoryAndDownloads" = true; # 2812
      "privacy.clearOnShutdown_v2.downloads" = true; # 2812
      "privacy.clearSiteData.historyFormDataAndDownloads" = true; # 2820
      "privacy.clearSiteData.browsingHistoryAndDownloads" = true; # 2821
      "privacy.clearHistory.historyFormDataAndDownloads" = true; # 2830
      "privacy.clearHistory.browsingHistoryAndDownloads" = true; # 2831

      # Personal
      ## Warnings
      "browser.tabs.warnOnClose" = false;
      "browser.tabs.warnOnCloseOtherTabs" = false;
      ## Updates
      "app.update.auto" = false;
      "browser.search.update" = false;
      ## Appearance
      "toolkit.legacyUserProfileCustomizations.stylesheets" = true;
      ## Content behavior
      "clipboard.autocopy" = false;
      ## UX behavior
      "browser.quitShortcut.disabled" = true;
      "browser.tabs.closeWindowWithLastTab" = false;
      ## UX features
      "extensions.pocket.enabled" = false;
      "identity.fxaccounts.enabled" = false;
    };

  # streaming =
  #   default
  #   + pkgs.lib.personal.toUserJS {
  #     # Cache
  #     "browser.cache.disk.enable" = true;
  #     "browser.cache.offline.storage" = true;
  #     # Privacy
  #     "privacy.clearOnShutdown_v2.cache" = false;
  #     "privacy.clearOnShutdown_v2.cookiesAndStorage" = false;
  #   };

  # videoconferencing =
  #   default
  #   + pkgs.lib.personal.toUserJS {
  #     # IMPORTANT: uncheck "Prevent WebRTC from leaking local IP addresses" in uBlock Origin's settings
  #     # NOTE: if using RFP (4501)
  #     # some sites, e.g. Zoom, need a canvas site exception [Right Click>View Page Info>Permissions]
  #     # Discord video does not work: it thinks you are FF78: use a separate profile or spoof the user agent
  #     "media.peerconnection.enabled" = true;
  #     "media.peerconnection.ice.no_host" = false; # may or may not be required
  #     "webgl.min_capability_mode" = true;
  #     "media.autoplay.blocking_policy" = 0; # optional (otherwise add site exceptions)
  #     "javascript.options.wasm" = true; # optional (some platforms may require this)
  #     "dom.webaudio.enabled" = true;
  #   };
in
{
  programs.firefox.profiles.default.extraConfig = default;
}