{config, lib, pkgs, inputs, os, ...} : lib.mkMerge [
  
  (lib.mkIf (os == "linux") {
    home.file.".mozilla/firefox/default/chrome/theme".source = 
      inputs.firefox-gnome-theme;
  })

  (lib.mkIf (os == "darwin") {
    home.file."/Users/stephans/Library/Application Support/Firefox/Profiles/default/chrome/theme".source = 
      inputs.firefox-macos-theme;
  })

  {
    programs.firefox = lib.mkMerge [
      (lib.mkIf (os == "darwin") {
        package = null;
      })
      {
        enable = true;
        profiles.default = {
          isDefault = true;
          userChrome = if (os == "linux") then ''
              @import "theme/userChrome.css";
          '' else ''
              @import "theme/chrome/userChrome.css";
              @import "theme/custom/singletabhidden.css";
          '';
          userContent = if (os == "linux") then ''
              @import "theme/userContent.css";
          '' else ''
              @import "theme/chrome/userContent.css";
          '';
          settings = {
              "toolkit.legacyUserProfileCustomizations.stylesheets" = true; # Enable customChrome.cs
              "browser.uidensity" = 0; # Set UI density to normal
              "svg.context-properties.content.enabled" = true; # Enable SVG context-propertes
              "browser.theme.dark-private-windows" = false; # Disable private window dark theme
              "extensions.autoDisableScopes" = 0; # Auto enable new extentions
              "browser.toolbars.bookmarks.visibility" = "never";
              "gnomeTheme.hideSingleTab" = true;
              "signon.rememberSignons" = false;
              "dom.private-attribution.submission.enabled" = false;
              "app.update.auto" = false;
          };
          extensions = with pkgs.nur.repos.rycee.firefox-addons; [ 
            ublock-origin 
            bitwarden 
            consent-o-matic
            sponsorblock
            multi-account-containers
          ] ++ (if (os == "darwin") then [
            onepassword-password-manager
          ] else [
            wayback-machine 
            h264ify 
            fediact 
            tampermonkey
          ]);
          search = {
            default = "DuckDuckGo";
            force = true;
          };
          containers = {
            "Personal" = {
              color = "green";
              icon = "circle";
              id = 3;
            };
            "ON2IT" = {
              color = "orange";
              icon = "circle";
              id = 1;
            };
            "Lekker van Peet" = {
              color = "blue";
              icon = "circle";
              id = 2;
            };
            "Radboud Universiteit" = {
              color = "red";
              icon = "circle";
              id = 4;
            };
            "Utrecht University" = {
              color = "yellow";
              icon = "circle";
              id = 5;
            };
          };
          containersForce = true;
        };
      }
    ];
  }
]