ok that was dumb

default.nix

@@ -110,10 +110,6 @@ let
         const sourceTarget = document.createElement('script')
         sourceTarget.src = '/main.js'
         document.body.appendChild(sourceTarget)
-
-        if ('serviceWorker' in navigator) {
-          window.addEventListener('load', () => navigator.serviceWorker.register('/sw.js'));
-        }
       '';
 
       templateHtml = pkgs.writeText "template-html" ''

webpack.config.js

@@ -101,7 +101,7 @@ module.exports = {
       name: PRETTY_NAME,
       template: './template.html',
       meta: {
-        viewport: 'width=device-width, initial-scale=1'
+        viewport: 'width=360, initial-scale=1, maximum-scale=1'
       }
     }),
     new FaviconsWebpackPlugin({