diff --git a/plugin-designs/posterverse/index.html b/plugin-designs/posterverse/index.html
index 5c76ce69f..4b1d1c361 100644
--- a/plugin-designs/posterverse/index.html
+++ b/plugin-designs/posterverse/index.html
@@ -15,7 +15,9 @@
 <body>
   <!-- Capability 5, the app shell: one element, <posterverse-app>, is a vertical-tab rail of every
        poster plugin. Each tab loads its plugin's own script lazily on first open. -->
-  <posterverse-app></posterverse-app>
+  <!-- This page is our own (the dev server's staging page), so the shell owns the address: the open tab is
+       written to ?tab=, a reload keeps it and a copied link opens it. -->
+  <posterverse-app profile-config='{"urlOwner":"app"}'></posterverse-app>
   <script type="module" src="./index.js"></script>
 </body>
 </html>