diff --git a/src/content.ts b/src/content.ts
index 93c2bb2..19fcf05 100644
--- a/src/content.ts
+++ b/src/content.ts
@@ -4,7 +4,37 @@ import {
   postWebpageMessage,
 } from './services/webpage';
 
+const PROBE_INTERVAL_MS = 1000;
+
 postWebpageMessage('INIT');
 addWebpageMessageListener((message) => {
   postExtensionMessage(message);
 });
+
+// A form can mount long after this script runs — inside a dialog, or on a client-side route —
+// and the page only announces itself in reply to an INIT. Probing just once therefore misses
+// every form that did not already exist, so keep asking while the tab is in the foreground.
+// https://github.com/react-hook-form/devtools-extension/issues/15
+let probeInterval: number | undefined;
+
+const startProbing = () => {
+  if (probeInterval === undefined) {
+    probeInterval = window.setInterval(
+      () => postWebpageMessage('INIT'),
+      PROBE_INTERVAL_MS,
+    );
+  }
+};
+
+const stopProbing = () => {
+  window.clearInterval(probeInterval);
+  probeInterval = undefined;
+};
+
+document.addEventListener('visibilitychange', () =>
+  document.hidden ? stopProbing() : startProbing(),
+);
+
+if (!document.hidden) {
+  startProbing();
+}