1 files changed, 69 insertions, 0 deletions
diff --git a/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_history_shift_click.js b/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_history_shift_click.js
new file mode 100644
index 0000000000..793bcd1a5d
--- /dev/null
+++ b/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_history_shift_click.js
@@ -0,0 +1,69 @@
+/* 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 () {
+  await testShiftClickOpensNewWindow("back-button");
+});
+
+add_task(async function () {
+  await testShiftClickOpensNewWindow("forward-button");
+});
+
+// Create new private browser, open new tab and set history state, then return the window
+async function createPrivateWindow() {
+  const privateWindow = await BrowserTestUtils.openNewBrowserWindow({
+    private: true,
+  });
+  await BrowserTestUtils.openNewForegroundTab(
+    privateWindow.gBrowser,
+    "http://example.com"
+  );
+  await SpecialPowers.spawn(
+    privateWindow.gBrowser.selectedBrowser,
+    [],
+    async function () {
+      content.history.pushState({}, "first item", "first-item.html");
+      content.history.pushState({}, "second item", "second-item.html");
+      content.history.pushState({}, "third item", "third-item.html");
+      content.history.back();
+    }
+  );
+  await TestUtils.topicObserved("sessionstore-state-write-complete");
+
+  // Wait for the session data to be flushed before continuing the test
+  await new Promise(resolve =>
+    SessionStore.getSessionHistory(privateWindow.gBrowser.selectedTab, resolve)
+  );
+
+  info("Private window created");
+
+  return privateWindow;
+}
+
+async function testShiftClickOpensNewWindow(buttonId) {
+  const privateWindow = await createPrivateWindow();
+
+  const button = privateWindow.document.getElementById(buttonId);
+  // Wait for the new private window to be created after click
+  const newPrivateWindowPromise = BrowserTestUtils.waitForNewWindow();
+
+  EventUtils.synthesizeMouseAtCenter(button, { shiftKey: true }, privateWindow);
+
+  info("Waiting for new private browser to open");
+
+  const newPrivateWindow = await newPrivateWindowPromise;
+
+  ok(
+    PrivateBrowsingUtils.isBrowserPrivate(newPrivateWindow.gBrowser),
+    "New window is private"
+  );
+
+  // Cleanup
+  await Promise.all([
+    BrowserTestUtils.closeWindow(privateWindow),
+    BrowserTestUtils.closeWindow(newPrivateWindow),
+  ]);
+
+  info("Closed all windows");
+}