diff --git a/modules/home/home-browser-helium-sidechery.ulu.nix b/modules/home/home-browser-helium-sidechery.ulu.nix
new file mode 100644
index 0000000..6989341
--- /dev/null
+++ b/modules/home/home-browser-helium-sidechery.ulu.nix
@@ -0,0 +1,100 @@
+{ ... }:
+{
+  # sidechery "sidebery" ported to chromium for helium built from source and side-loaded.
+  flake.homeModules.home-browser-helium-sidechery =
+    {
+      config,
+      lib,
+      pkgs,
+      inputs,
+      ...
+    }:
+    let
+      sidechery = pkgs.stdenv.mkDerivation (finalAttrs: {
+        pname = "sidechery";
+        version = (builtins.fromJSON (builtins.readFile "${inputs.sidechery}/package.json")).version;
+        src = inputs.sidechery;
+
+        pnpmDeps = pkgs.fetchPnpmDeps {
+          inherit (finalAttrs) pname version src;
+          pnpm = pkgs.pnpm_10;
+          fetcherVersion = 4;
+          hash = "sha256-c05e5Wchb3mq45cHcjjiUCAzi9RrhtKWunYJ7QK30wM=";
+        };
+
+        nativeBuildInputs = [
+          pkgs.nodejs
+          pkgs.pnpm_10
+          pkgs.pnpmConfigHook
+        ];
+
+        buildPhase = ''
+          runHook preBuild
+          pnpm run build:chrome
+          runHook postBuild
+        '';
+
+        installPhase = ''
+          runHook preInstall
+          cp -r .output/chrome-mv3 $out
+          runHook postInstall
+        '';
+      });
+
+      panelColors = [
+        "red"
+        "orange"
+        "yellow"
+        "green"
+        "cyan"
+        "purple"
+        "pink"
+      ];
+
+      sidechery-styled = pkgs.runCommand "sidechery-styled" { } ''
+        cp -r ${sidechery} $out
+        chmod -R u+w $out
+        cat ${pkgs.writeText "sidechery-extra.css" config.elars.sidechery.extraCss} >> $out/styles/sidebar.css
+      '';
+    in
+    {
+      options.elars.sidechery.extraCss = lib.mkOption {
+        type = lib.types.lines;
+        default = "";
+        description = ''
+          CSS appended to sidechery's sidebar stylesheet at build time, so
+          styling doesn't depend on the in-extension styles editor.
+        '';
+      };
+      config.xdg.configFile."sidechery/panels.json".text = builtins.toJSON {
+        ver = sidechery.version;
+        sidebar = {
+          panels = lib.genAttrs panelColors (color: {
+            type = 2; # PanelType.tabs
+            id = color;
+            name = color;
+            inherit color;
+            iconSVG = "icon_circle";
+          });
+          nav = panelColors ++ [
+            "collapse"
+            "settings"
+            "create_snapshot"
+          ];
+        };
+      };
+
+      config.programs.helium = {
+        extraFlags = [ "--load-extension=${sidechery-styled}" ];
+
+        preferences = {
+          helium.browser.layout = 2;
+          extensions.commands."linux:Ctrl+S" = {
+            command_name = "_execute_action";
+            extension = "napehjbogfncaoogcckddbidjgcapclg";
+            global = false;
+          };
+        };
+      };
+    };
+}
diff --git a/modules/home/home-browser-helium.ulu.nix b/modules/home/home-browser-helium.ulu.nix
index 1266b7c..aea4656 100644
--- a/modules/home/home-browser-helium.ulu.nix
+++ b/modules/home/home-browser-helium.ulu.nix
@@ -11,6 +11,10 @@
         package = inputs.helium.packages.${system}.helium-widevine;
 
         extensions = [
+          {
+            id = "clngdbkpkpeebahjckkjfobafhncgmne";
+            hash = "sha256-82toCWp5v/Crf35et50ISOw2Q66ZhJrCx59rhDVTRPk=";
+          }
           {
             id = "dkdnancajokhfclpjpplkhlkbhaeejob";
             hash = "sha256-hkEGW2JVQzeRmTpoPrWFoVG3sbCgHohnsr2b12rfeMg=";
@@ -57,7 +61,6 @@
 
         preferences = {
           helium.browser = {
-            layout = 2;
             zen_mode = true;
             zen_mode_sidebar_pinned = true;
             zen_mode_top_chrome_pinned = true;
@@ -65,7 +68,6 @@
             minimal_location_bar = true;
             rounded_frame = false;
             new_tab_next_to_active = false;
-            vertical_right_aligned = false;
             show_back_button = true;
             show_extensions_button = true;
             show_media_button = true;