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diff --git a/docshell/test/mochitest/test_bug529119-1.html b/docshell/test/mochitest/test_bug529119-1.html
new file mode 100644
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+++ b/docshell/test/mochitest/test_bug529119-1.html
@@ -0,0 +1,110 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Test bug 529119</title>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.requestFlakyTimeout("untriaged");
+
+var workingURL = "http://mochi.test:8888/tests/docshell/test/mochitest/bug529119-window.html";
+var faultyURL = "https://www.some-nonexistent-domain-27489274c892748217cn2384.test/";
+
+var w = null;
+var phase = 0;
+var gotWrongPageOnTryAgainClick = false;
+// Token that represents which page we currently have loaded.
+var token = 0;
+
+function delay(msec) {
+  return new Promise(resolve => setTimeout(resolve, msec));
+}
+
+async function assignToken(tokenToAssign) {
+  await SpecialPowers.spawn(w, [tokenToAssign],
+                            newToken => { this.content.token = newToken });
+}
+
+async function pollForPage(win) {
+  while (true) {
+    try {
+      // When we do our navigation, there may be an interstitial about:blank
+      // page if the navigation involves a process switch.  That about:blank
+      // will exist between the new process's docshell being created and the
+      // actual page that's being loaded loading (which can happen async from
+      // the docshell creation).  We want to avoid treating the initial
+      // about:blank as a new page.
+      //
+      // We could conceivably expose Document::IsInitialDocument() as a
+      // ChromeOnly thing and use it here, but let's just filter out all
+      // about:blank, since we don't expect any in this test.
+      var haveNewPage = await SpecialPowers.spawn(w, [token],
+        currentToken => this.content.token != currentToken &&
+                        this.content.location.href != "about:blank");
+
+      if (haveNewPage) {
+        ++token;
+        assignToken(token);
+        break;
+      }
+    } catch (e) {
+      // Something went wrong; just keep waiting.
+    }
+
+    await delay(100);
+  }
+}
+
+async function windowLoaded() {
+  switch (phase) {
+    case 0:
+      assignToken(token);
+
+      /* 2. We have succeededfully loaded a page, now go to a faulty URL */
+      window.setTimeout(function() {
+        w.location.href = faultyURL;
+      }, 0);
+
+      phase = 1;
+
+      await pollForPage(w);
+      is(await SpecialPowers.spawn(w, [], () => this.content.location.href),
+         faultyURL,
+         "Is on an error page initially");
+
+      /* 3. now, while we are on the error page, try to reload it, actually
+         click the "Try Again" button */
+      SpecialPowers.spawn(w, [], () => this.content.location.reload());
+
+      await pollForPage(w);
+
+      /* 4-finish, check we are still on the error page */
+      is(await SpecialPowers.spawn(w, [], () => this.content.location.href),
+         faultyURL,
+         "Is on an error page");
+      is(gotWrongPageOnTryAgainClick, false,
+        "Must not get www.example.com page on reload of an error page");
+      w.close();
+      SimpleTest.finish();
+      break;
+
+    case 1:
+      /* 4-check, we must not get here! */
+      gotWrongPageOnTryAgainClick = true;
+      break;
+  }
+}
+
+function startTest() {
+  /* 1. load a URL that leads to an error page */
+  w = window.open(workingURL);
+}
+
+</script>
+</head>
+<body onload="startTest();">
+</body>
+</html>