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diff --git a/docshell/test/mochitest/test_bug1729662.html b/docshell/test/mochitest/test_bug1729662.html
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+++ b/docshell/test/mochitest/test_bug1729662.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test back/forward after pushState</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
+  <script>
+    SimpleTest.waitForExplicitFinish();
+    SimpleTest.requestFlakyTimeout("Need to wait to make sure an event does not fire");
+
+    async function runTest() {
+      let win = window.open();
+      let goneBackAndForwardOnce = new Promise((resolve) => {
+        let timeoutID;
+
+        // We should only get one load event in win.
+        let bc = new BroadcastChannel("bug1729662");
+        bc.addEventListener("message", () => {
+          bc.addEventListener("message", () => {
+            clearTimeout(timeoutID);
+            resolve(false);
+          });
+        }, { once: true });
+
+        let goneBack = false, goneForward = false;
+        win.addEventListener("popstate", ({ state }) => {
+          // We should only go back and forward once, if we get another
+          // popstate after that then we should fall through to the
+          // failure case below.
+          if (!(goneBack && goneForward)) {
+            // Check if this is the popstate for the forward (the one for
+            // back will have state == undefined).
+            if (state == 1) {
+              ok(goneBack, "We should have gone back before going forward");
+
+              goneForward = true;
+
+              // Wait a bit to make sure there are no more popstate events.
+              // eslint-disable-next-line mozilla/no-arbitrary-setTimeout
+              timeoutID = setTimeout(resolve, 1000, true);
+
+              return;
+            }
+
+            // Check if we've gone back once before, if we get another
+            // popstate after that then we should fall through to the
+            // failure case below.
+            if (!goneBack) {
+              goneBack = true;
+
+              return;
+            }
+          }
+
+          clearTimeout(timeoutID);
+          resolve(false);
+        });
+      });
+
+      win.location = "file_bug1729662.html";
+
+      ok(await goneBackAndForwardOnce, "Stopped navigating history");
+
+      win.close();
+
+      SimpleTest.finish();
+    }
+  </script>
+</head>
+<body onload="runTest();">
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+</body>
+</html>