1 files changed, 43 insertions, 0 deletions
diff --git a/browser/components/sessionstore/test/browser_662812.js b/browser/components/sessionstore/test/browser_662812.js
new file mode 100644
index 0000000000..9a51453432
--- /dev/null
+++ b/browser/components/sessionstore/test/browser_662812.js
@@ -0,0 +1,43 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  waitForExplicitFinish();
+
+  window.addEventListener(
+    "SSWindowStateBusy",
+    function() {
+      let state = ss.getWindowState(window);
+      ok(state.windows[0].busy, "window is busy");
+
+      window.addEventListener(
+        "SSWindowStateReady",
+        function() {
+          let state2 = ss.getWindowState(window);
+          ok(!state2.windows[0].busy, "window is not busy");
+
+          executeSoon(() => {
+            gBrowser.removeTab(gBrowser.tabs[1]);
+            finish();
+          });
+        },
+        { once: true }
+      );
+    },
+    { once: true }
+  );
+
+  // create a new tab
+  let tab = BrowserTestUtils.addTab(gBrowser, "about:mozilla");
+  let browser = tab.linkedBrowser;
+
+  // close and restore it
+  browser.addEventListener(
+    "load",
+    function() {
+      gBrowser.removeTab(tab);
+      ss.undoCloseTab(window, 0);
+    },
+    { capture: true, once: true }
+  );
+}