1 files changed, 46 insertions, 0 deletions
diff --git a/browser/base/content/test/tabs/browser_close_during_beforeunload.js b/browser/base/content/test/tabs/browser_close_during_beforeunload.js
new file mode 100644
index 0000000000..2a93e29c00
--- /dev/null
+++ b/browser/base/content/test/tabs/browser_close_during_beforeunload.js
@@ -0,0 +1,46 @@
+"use strict";
+
+// Tests that a second attempt to close a window while blocked on a
+// beforeunload confirmation ignores the beforeunload listener and
+// unblocks the original close call.
+
+const CONTENT_PROMPT_SUBDIALOG = Services.prefs.getBoolPref(
+  "prompts.contentPromptSubDialog",
+  false
+);
+
+const DIALOG_TOPIC = CONTENT_PROMPT_SUBDIALOG
+  ? "common-dialog-loaded"
+  : "tabmodal-dialog-loaded";
+
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["dom.require_user_interaction_for_beforeunload", false]],
+  });
+
+  let win = await BrowserTestUtils.openNewBrowserWindow();
+
+  let browser = win.gBrowser.selectedBrowser;
+  // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+  BrowserTestUtils.loadURIString(browser, "http://example.com/");
+  // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+  await BrowserTestUtils.browserLoaded(browser, false, "http://example.com/");
+
+  await SpecialPowers.spawn(browser, [], () => {
+    // eslint-disable-next-line mozilla/balanced-listeners
+    content.addEventListener("beforeunload", event => {
+      event.preventDefault();
+    });
+  });
+
+  let confirmationShown = false;
+
+  BrowserUtils.promiseObserved(DIALOG_TOPIC).then(() => {
+    confirmationShown = true;
+    win.close();
+  });
+
+  win.close();
+  ok(confirmationShown, "Before unload confirmation should have been shown");
+  ok(win.closed, "Window should have been closed after second close() call");
+});