1 files changed, 55 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 0000000000..507d10a5f1
--- /dev/null
+++ b/browser/components/sessionstore/test/browser_739531.js
@@ -0,0 +1,55 @@
+/* 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 = BrowserTestUtils.addTab(gBrowser, testURL);
+
+  let removeFunc;
+  removeFunc = BrowserTestUtils.addContentEventListener(
+    tab.linkedBrowser,
+    "load",
+    function onLoad(aEvent) {
+      // make sure both the page and the frame are loaded
+      if (++loadCount < 2) {
+        return;
+      }
+      removeFunc();
+
+      // 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
+  );
+}