1 files changed, 48 insertions, 0 deletions
diff --git a/dom/tests/browser/browser_bug1709346.js b/dom/tests/browser/browser_bug1709346.js
new file mode 100644
index 0000000000..bcfe456196
--- /dev/null
+++ b/dom/tests/browser/browser_bug1709346.js
@@ -0,0 +1,48 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+add_task(async function remove_subframe_in_cross_site_frame() {
+  await BrowserTestUtils.withNewTab(
+    "http://mochi.test:8888/browser/dom/tests/browser/file_empty_cross_site_frame.html",
+    async browser => {
+      await TestUtils.waitForCondition(
+        () => !XULBrowserWindow.isBusy,
+        "browser is not busy after the tab finishes loading"
+      );
+
+      // Spawn into the cross-site subframe, and begin loading a slow network
+      // connection. We'll cancel the load before this navigation completes.
+      await SpecialPowers.spawn(
+        browser.browsingContext.children[0],
+        [],
+        async () => {
+          let frame = content.document.createElement("iframe");
+          frame.src = "load_forever.sjs";
+          content.document.body.appendChild(frame);
+
+          frame.addEventListener("load", function () {
+            ok(false, "load should not finish before the frame is removed");
+          });
+        }
+      );
+
+      is(
+        XULBrowserWindow.isBusy,
+        true,
+        "browser should be busy after the load starts"
+      );
+
+      // Remove the outer iframe, ending the load within this frame's subframe
+      // early.
+      await SpecialPowers.spawn(browser, [], async () => {
+        content.document.querySelector("iframe").remove();
+      });
+
+      await TestUtils.waitForCondition(
+        () => !XULBrowserWindow.isBusy,
+        "Browser should no longer be busy after the frame is removed"
+      );
+    }
+  );
+});