nixos-config/sets/firefox.nix

{ ... }:
{
  programs.firefox = {
    enable = true;
    languagePacks = [
      "en-US"
      "de"
    ];
    preferences = {
      "app.shield.outputstudies.enabled" = false;
      "browser.urlbar.switchTabs.adoptIntoActiveWindow" = true;
      "browser.newtabpage.activity-stream.feeds.topsites" = false;
      "browser.newtabpage.activity-stream.feeds.section.topstories" = false;
    };
    policies.SearchEngines.Default = "duckduckgo";
    policies.ExtensionSettings = {
      "uBlock0@raymondhill.net" = {
        installation_mode = "normal_installed";
        install_url = "https://addons.mozilla.org/firefox/downloads/latest/ublock-origin/latest.xpi";
      };
      "@testpilot-containers" = {
        installation_mode = "normal_installed";
        install_url = "https://addons.mozilla.org/firefox/downloads/latest/multi-account-containers/latest.xpi";
      };
      "sponsorBlocker@ajay.app" = {
        installation_mode = "normal_installed";
        install_url = "https://addons.mozilla.org/firefox/downloads/latest/sponsorblock/latest.xpi";
      };
    };
  };
}