{
  config,
  inputs,
  lib,
  pkgs,
  ...
}:
with lib; let
  cfg = config.nixfiles.modules.firefox;
in {
  options.nixfiles.modules.firefox.enable = mkEnableOption "Firefox";

  config = mkIf cfg.enable {
    hm = {
      imports = [inputs.arkenfox-nixos.hmModules.arkenfox];

      home.packages = with pkgs; [profile-cleaner];

      programs.firefox = {
        enable = true;

        package = pkgs.firefox;

        arkenfox.enable = true;

        profiles.default = let
          mkCssWithRoot = css:
            mkMerge [
              (with config.colourScheme; ''
                :root {
                    --black: ${black};
                    --red: ${red};
                    --green: ${green};
                    --yellow: ${yellow};
                    --blue: ${blue};
                    --magenta: ${magenta};
                    --cyan: ${cyan};
                    --white: ${white};
                    --bright-black: ${brightBlack};
                    --bright-red: ${brightRed};
                    --bright-green: ${brightGreen};
                    --bright-yellow: ${brightYellow};
                    --bright-blue: ${brightBlue};
                    --bright-magenta: ${brightMagenta};
                    --bright-cyan: ${brightCyan};
                    --bright-white: ${brightWhite};
                    --background: ${background};
                    --foreground: ${foreground};
              '')
              (with config.fontScheme; ''
                    --sans-serif-font-family: "${sansSerifFont.family}", "${sansSerifFontFallback.family}", sans-serif;
                    --sans-serif-font-size: ${toString sansSerifFont.size}px;
                    --serif-font-family: "${serifFont.family}", "${serifFontFallback.family}", serif;
                    --serif-font-size: ${toString serifFont.size}px;
                    --monospace-font-family: "${monospaceFont.family}", "${monospaceFontFallback.family}", monospace;
                    --monospace-font-size: ${toString monospaceFont.size}px;
                }
              '')
              (builtins.readFile css)
            ];
        in {
          id = 0;

          isDefault = true;

          userChrome = mkCssWithRoot ./userChrome.css;

          userContent = mkCssWithRoot ./userContent.css;

          extensions = with pkgs.nur.repos.rycee.firefox-addons; [
            bitwarden
            consent-o-matic
            darkreader
            localcdn
            noscript
            privacy-redirect
            ublock-origin
            violentmonkey
          ];

          # https://github.com/arkenfox/user.js/blob/master/user.js
          arkenfox = {
            enable = true;
            "0000".enable = true;
            "0100" = {
              enable = true;
              "0102" = {
                enable = true;
                "browser.startup.page" = {
                  enable = true;
                  value = 3;
                };
              };
            };
            "0200".enable = true;
            "0300".enable = true;
            "0400" = {
              enable = false;
              "0401" = {
                enable = true;
                "browser.safebrowsing.malware.enabled" = {
                  enable = true;
                  value = false;
                };
                "browser.safebrowsing.phishing.enabled" = {
                  enable = true;
                  value = false;
                };
              };
              "0402" = {
                enable = true;
                "browser.safebrowsing.downloads.enabled" = {
                  enable = true;
                  value = false;
                };
              };
              "0404" = {
                enable = true;
                "browser.safebrowsing.downloads.remote.block_potentially_unwanted" = {
                  enable = true;
                  value = false;
                };
                "browser.safebrowsing.downloads.remote.block_uncommon" = {
                  enable = true;
                  value = false;
                };
              };
            };
            "0600".enable = true;
            "0700" = {
              enable = true;
              "0701" = {
                enable = true;
                "network.dns.disableIPv6" = {
                  enable = true;
                  value = false;
                };
              };
              "0710" = {
                enable = true;
                "network.trr.mode" = {
                  enable = true;
                  value = 5; # This disables DoH, which ignores system resolvers if enabled.
                };
              };
            };
            "0800" = {
              enable = true;
              "0801" = {
                enable = true;
                "keyword.enabled" = {
                  enable = true;
                  value = true;
                };
              };
              "0808" = {
                enable = true;
                "browser.urlbar.suggest.engines" = {
                  enable = true;
                  value = false;
                };
              };
              "0810" = {
                enable = true;
                "browser.formfill.enable" = {
                  enable = true;
                  value = true;
                };
              };
            };
            "0900".enable = true;
            "1000" = {
              enable = true;
              "1001"."browser.cache.disk.enable" = {
                enable = true;
                value = true;
              };
            };
            "1200".enable = true;
            "1700" = {
              enable = false;
              "1701" = {
                enable = true;
                "privacy.userContext.enabled" = {
                  enable = true;
                  value = false;
                };
                "privacy.userContext.ui.enabled" = {
                  enable = true;
                  value = false;
                };
              };
              "1702" = {
                enable = true;
                "privacy.userContext.newTabContainerOnLeftClick.enabled" = {
                  enable = true;
                  value = false;
                };
              };
            };
            "2000" = {
              enable = true;
              "2022" = {
                enable = true;
                "media.eme.enabled" = {
                  enable = true;
                  value = false;
                };
                "browser.eme.ui.enabled" = {
                  enable = true;
                  value = false;
                };
              };
            };
            "2400".enable = false;
            "2600" = {
              enable = true;
              "2615" = {
                enable = true;
                "permissions.default.shortcuts" = {
                  enable = true;
                  value = 2;
                };
              };
            };
            "2700".enable = true;
            "2800".enable = true;
          };

          settings = {
            "app.update.auto" = false;
            "browser.backspace_action" = 0;
            "browser.bookmarks.max_backups" = 1;
            "browser.disableResetPrompt" = true;
            "browser.download.autohideButton" = false;
            "browser.newtabpage.activity-stream.feeds.system.topsites" = false;
            "browser.newtabpage.activity-stream.feeds.topsites" = false;
            "browser.newtabpage.introShown" = true;
            "browser.onboarding.enabled" = false;
            "browser.search.region" = "US";
            "browser.search.update" = false;
            "browser.startup.homepage_welcome_url" = "";
            "browser.startup.homepage_welcome_url.additional" = "";
            "browser.tabs.closeWindowWithLastTab" = true;
            "browser.tabs.firefox-view" = false;
            "browser.tabs.inTitlebar" =
              if config.nixfiles.modules.kde.enable
              then 1
              else 0;
            "browser.tabs.warnOnClose" = false;
            "browser.tabs.warnOnCloseOtherTabs" = false;
            "browser.tabs.warnOnOpen" = false;
            "browser.toolbars.bookmarks.visibility" = "never";
            "browser.urlbar.decodeURLsOnCopy" = true;
            "browser.warnOnQuitShortcut" = false;
            "extensions.pocket.enabled" = false;
            "extensions.screenshots.disabled" = true;
            "extensions.update.autoUpdateDefault" = false;
            "extensions.update.enabled" = false;
            "full-screen-api.warning.delay" = 0;
            "full-screen-api.warning.timeout" = 0;
            "general.autoScroll" = true;
            "general.smoothScroll" = true;
            "gfx.font_rendering.opentype_svg.enabled" = false;
            "identity.fxaccounts.enabled" = false;
            "media.autoplay.blocking_policy" = 2;
            "media.autoplay.default" = 5;
            "media.autoplay.enabled" = false;
            "media.hardwaremediakeys.enabled" = false;
            "reader.parse-on-load.enabled" = false;
            "signon.rememberSignons" = false;
            "toolkit.legacyUserProfileCustomizations.stylesheets" = true;
          };
        };
      };
    };
  };
}