{ config, pkgs, ... }:
  let
    lock-false = {
      Value = false;
      Status = "locked";
    };
    lock-true = {
      Value = true;
      Status = "locked";
    };
  in
{
  programs.firefox = {
    enable = true;

    policies = {
      EnableTrackingProtection = {
        Value = true;
        Locked = true;
        Cryptomining = true;
        Fingerprinting = true;
        EmailTracking = true;
      };

      # Certificates
      Certificates = {
        ImportEnterpriseRoots = true;
      };

      # Cookies
      Cookies = {
        Behavior = "reject-foreign";
        BehaviorPrivateBrowsing = "reject-foreign";
        Locked = true;
      };

      # DNS
      DNSOverHTTPS = {
        Enabled = false;
        Locked = true;
      };

      # Disable Bad
      DisableAppUpdate = true;
      DisableAccounts = true;
      DisableFirefoxAccounts = true;
      DisableFirefoxScreenshots = true;
      DisableFirefoxStudies = true;
      DisablePocket = true;
      DisableTelemetry = true;
      AutofillAddressEnabled = false;
      AutofillCreditCardEnabled = false;

      # Disable Certain Messages
      UserMessaging = {
        WhatsNew = false;
        ExtensionRecommendations = false;
        FeatureRecommendations = false;
        UrlbarInterventions = false;
        SkipOnboarding = true;
        MoreFromMozilla = false;
        Labs = false;
        Locked = true;
      };

      # Disable Password Manager
      PasswordManagerEnabled = false;
      PrimaryPassword = false;
      OfferToSaveLogins = false;

      # Remove Special Pages
      OverrideFirstRunPage = "";
      OverridePostUpdatePage = "";

      # Start Page
      Homepage = {
        StartPage = "previous-session";
        Loked = true;
      };

      # Home Page
      FirefoxHome = {
        Search = true;
        TopSites = false;
        SponsoredTopSites = false;
        Highlights = false;
        Pocket = false;
        SponsoredPocket = false;
        Snippets = false;
        Locked = true;
      };

      # Search Suggestions
      SearchSuggestEnabled = true;
      FirefoxSuggest = {
        WebSuggestions = false;
        SponsoredSuggestions = false;
        ImproveSuggest = false;
        Locked = true;
      };

      # Save All on Shutdown
      SanitizeOnShutdown = {
        Cache = false;
        Cookies = false;
        Downloads = false;
        Histroy = false;
        Sessions = false;
        SiteSettings = false;
        OfflineApps = false;
        Locked = true;
      };

      # Popups
      PopupBlocking = {
        Default = true;
        Locked = true;
      };

      # Allow Bypasses
      DisableSecurityBypass = {
        InvalidCertificate = false;
        SafeBrowsing = false;
      };

      # PictureInPicure
      PictureInPicture = {
        Enabled = true;
        Locked = true;
      };

      # Topbar
      SearchBar = "unified";
      DisplayMenuBar = "default-off";
      DisplayBookmarksToolbar = "newtab";
      NoDefaultBookmarks = true;

      # Miscellaneous
      HttpsOnlyMode = "force_enabled";
      HardwareAcceleration = true;
      DontCheckDefaultBrowser = true;
      PromptForDownloadLocation = false;
      PrivateBrowsingModeAvailability = 0;

      # Extensions
      ExtensionSettings = {
        "*".installation_mode = "blocked";
        # uBlock Origin
        "uBlock0@raymondhill.net" = {
          install_url = "https://addons.mozilla.org/firefox/downloads/latest/ublock-origin/latest.xpi";
          installation_mode = "force_installed";
        };
        # Bitwarden
        "{446900e4-71c2-419f-a6a7-df9c091e268b}" = {
          install_url = "https://addons.mozilla.org/firefox/downloads/latest/bitwarden-password-manager/latest.xpi";
          installation_mode = "force_installed";
        };
      };

      # about:config Preferences
      Preferences = {
        # theme
        "toolkit.legacyUserProfileCustomizations.stylesheets" = lock-true;
        "extensions.activeThemeID" = {
          Value = "firefox-compact-dark@mozilla.org";
          Status = "locked";
        };
        # homepage
        "browser.startup.homepage" = {
          Value = "	about:home";
          Status = "locked";
        };
        "browser.newtabpage.enabed" = lock-true;
        "browser.newtabpage.url" = {
          Value = "	about:home";
          Status = "locked";
        };
        # search enable
        "browser.urlbar.suggest.recentsearches" = lock-true;
        "browser.urlbar.suggest.bookmark" = lock-true;
        "browser.urlbar.suggest.clipboard" = lock-true;
        "browser.urlbar.suggest.history" = lock-true;
        # search disable
        "browser.urlbar.suggest.addons" = lock-false;
        "browser.urlbar.suggest.calculator" = lock-false;
        "browser.urlbar.suggest.engines" = lock-false;
        "browser.urlbar.suggest.fakespot" = lock-false;
        "browser.urlbar.suggest.mdn" = lock-false;
        "browser.urlbar.suggest.openpage" = lock-false;
        "browser.urlbar.suggest.pocket" = lock-false;
        "browser.urlbar.suggest.remotetab" = lock-false;
        "browser.urlbar.suggest.topsites" = lock-false;
        "browser.urlbar.suggest.trending" = lock-false;
        "browser.urlbar.suggest.weather" = lock-false;
        "browser.urlbar.suggest.yelp" = lock-false;
        # privacy
        "privacy.globalprivacycontrol.enabled" = lock-true;
        # security
        "security.OCSP.enabled" = {
          Value = 0;
          Status = "locked";
        };
        "browser.contentblocking.category" = {
          Value = "strict";
          Status = "locked";
        };
        # graphics
        "dom.webgpu.enabled" = lock-true;
        "media.eme.enabled" = lock-true;
        # tabs
        "browser.tabs.inTitlebar" = {
          Value = 1;
          Status = "locked";
        };
        "browser.tabs.warnOnClose" = lock-true;
        "browser.tabs.firefox-view" = lock-false;
        # user messaging
        "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;
        # safebrowsing
        "browser.safebrowsing.malware.enabled" = lock-true;
        "browser.safebrowsing.phishing.enabled" = lock-true;
        "browser.safebrowsing.downloads.enabled" = lock-true;
        "browser.safebrowsing.downloads.remote.block_uncommon" = lock-false;
        "browser.safebrowsing.downloads.remote.block_potentially_unwanted" = lock-false;
        # misc
        "general.autoScroll" = lock-false;
        "general.smoothScroll" = lock-true;
        "widget.gtk.overlay-scrollbars.enabled" = lock-false;
        "accessibility.browsewithcaret" = lock-false;
        "accessibility.typeaheadfind" = lock-false;
        "media.hardwaremediakeys.enabled" = lock-true;
        "browser.crashReports.unsubmittedCheck.autoSubmit2" = lock-false;
      };
    };

    profiles = {
      "freya" = {
        search = {
          force = true;
          default = "DuckDuckGo";
        };
        userChrome = ''
          #firefox-view-button {
            visibility: collapse;
          }
          #alltabs-button {
            visibility: collapse;
          }
          #tabbrowser-tabs {
            border-inline-start: none !important;
          }
        '';
      };
    };
  };
}