1 files changed, 47 insertions, 0 deletions
diff --git a/browser/components/sessionstore/test/browser_739531.js b/browser/components/sessionstore/test/browser_739531.js
new file mode 100644
index 000000000..e5927caf6
--- /dev/null
+++ b/browser/components/sessionstore/test/browser_739531.js
@@ -0,0 +1,47 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// This test ensures that attempts made to save/restore ("duplicate") pages
+// using designmode AND make changes to document structure (remove body)
+// don't result in uncaught errors and a broken browser state.
+
+function test() {
+  waitForExplicitFinish();
+
+  let testURL = "http://mochi.test:8888/browser/" +
+    "browser/components/sessionstore/test/browser_739531_sample.html";
+
+  let loadCount = 0;
+  let tab = gBrowser.addTab(testURL);
+  tab.linkedBrowser.addEventListener("load", function onLoad(aEvent) {
+    // make sure both the page and the frame are loaded
+    if (++loadCount < 2)
+      return;
+    tab.linkedBrowser.removeEventListener("load", onLoad, true);
+
+    // executeSoon to allow the JS to execute on the page
+    executeSoon(function() {
+
+      let tab2;
+      let caughtError = false;
+      try {
+        tab2 = ss.duplicateTab(window, tab);
+      }
+      catch (e) {
+        caughtError = true;
+        info(e);
+      }
+
+      is(gBrowser.tabs.length, 3, "there should be 3 tabs")
+
+      ok(!caughtError, "duplicateTab didn't throw");
+
+      // if the test fails, we don't want to try to close a tab that doesn't exist
+      if (tab2)
+        gBrowser.removeTab(tab2);
+      gBrowser.removeTab(tab);
+
+      finish();
+    });
+  }, true);
+}