diff -r 000000000000 -r 6474c204b198 browser/base/content/test/general/browser_findbarClose.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/base/content/test/general/browser_findbarClose.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,40 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Tests find bar auto-close behavior
+
+let newTab, iframe;
+
+function test() {
+  waitForExplicitFinish();
+  newTab = gBrowser.addTab("about:blank");
+  newTab.linkedBrowser.addEventListener("DOMContentLoaded",
+    prepareTestFindBarStaysOpenOnSubdocumentLocationChange, false);
+  newTab.linkedBrowser.contentWindow.location = "http://example.com/browser/" +
+    "browser/base/content/test/general/test_bug628179.html";
+}
+
+function prepareTestFindBarStaysOpenOnSubdocumentLocationChange() {
+  newTab.linkedBrowser.removeEventListener("DOMContentLoaded",
+    prepareTestFindBarStaysOpenOnSubdocumentLocationChange, false);
+
+  gFindBar.open();
+
+  iframe = newTab.linkedBrowser.contentDocument.getElementById("iframe");
+  iframe.addEventListener("load",
+    testFindBarStaysOpenOnSubdocumentLocationChange, false);
+  iframe.src = "http://example.org/";
+}
+
+function testFindBarStaysOpenOnSubdocumentLocationChange() {
+  iframe.removeEventListener("load",
+    testFindBarStaysOpenOnSubdocumentLocationChange, false);
+
+  ok(!gFindBar.hidden, "the Find bar isn't hidden after the location of a " +
+     "subdocument changes");
+
+  gFindBar.close();
+  gBrowser.removeTab(newTab);
+  finish();
+}
+