got it to work

extension-playwright/vite.config.mts

@@ -14,28 +14,17 @@
  * limitations under the License.
  */
 
-import { resolve } from 'path';
+import { fileURLToPath } from 'url';
+import { dirname, resolve } from 'path';
 import { defineConfig } from 'vite';
 import react from '@vitejs/plugin-react';
-import { viteStaticCopy } from 'vite-plugin-static-copy';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
 
 // https://vitejs.dev/config/
 export default defineConfig({
-  plugins: [
-    react(),
-    viteStaticCopy({
-      targets: [
-        {
-          src: '../../icons/*',
-          dest: 'icons'
-        },
-        {
-          src: '../../manifest.json',
-          dest: '.'
-        }
-      ]
-    })
-  ],
+  plugins: [react()],
   root: resolve(__dirname, 'src/ui'),
   build: {
     outDir: resolve(__dirname, 'dist/'),