diff --git a/server/shell.ts b/server/shell.ts
index bd634b0..3682a28 100644
--- a/server/shell.ts
+++ b/server/shell.ts
@@ -446,6 +446,15 @@ export function renderModuleLanding(opts: ModuleLandingOptions): string {
       width: 100%; height: 100%; border: none;
     }
   </style>
+  <script>
+    /* Unregister any stale service workers on rspace.online to prevent
+       them from intercepting cross-origin iframe requests */
+    if ('serviceWorker' in navigator) {
+      navigator.serviceWorker.getRegistrations().then(function(regs) {
+        regs.forEach(function(r) { r.unregister(); });
+      });
+    }
+  </script>
   <script defer src="https://rdata.online/collect.js" data-website-id="6ee7917b-0ed7-44cb-a4c8-91037638526b"></script>
 </head>
 <body data-theme="${theme}">
@@ -460,7 +469,7 @@ export function renderModuleLanding(opts: ModuleLandingOptions): string {
     </div>
   </header>
   <div class="ml-frame-wrap">
-    <iframe src="${embedUrl}" allow="clipboard-write; fullscreen"></iframe>
+    <iframe src="${embedUrl}" allow="clipboard-write; fullscreen" sandbox="allow-scripts allow-same-origin allow-popups allow-forms allow-modals"></iframe>
   </div>
   <script type="module">
     import '/shell.js';
