1 files changed, 46 insertions, 0 deletions
diff --git a/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_zoom.js b/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_zoom.js
new file mode 100644
index 0000000000..048796e7d2
--- /dev/null
+++ b/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_zoom.js
@@ -0,0 +1,46 @@
+/* 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/. */
+
+// This test makes sure that private browsing turns off doesn't cause zoom
+// settings to be reset on tab switch (bug 464962)
+
+add_task(async function test() {
+  let win = await BrowserTestUtils.openNewBrowserWindow({ private: true });
+  let tabAbout = await BrowserTestUtils.openNewForegroundTab(
+    win.gBrowser,
+    "about:mozilla"
+  );
+  let tabMozilla = await BrowserTestUtils.openNewForegroundTab(
+    win.gBrowser,
+    "about:mozilla"
+  );
+
+  let mozillaZoom = win.ZoomManager.zoom;
+
+  // change the zoom on the mozilla page
+  win.FullZoom.enlarge();
+  // make sure the zoom level has been changed
+  isnot(win.ZoomManager.zoom, mozillaZoom, "Zoom level can be changed");
+  mozillaZoom = win.ZoomManager.zoom;
+
+  // switch to about: tab
+  await BrowserTestUtils.switchTab(win.gBrowser, tabAbout);
+
+  // switch back to mozilla tab
+  await BrowserTestUtils.switchTab(win.gBrowser, tabMozilla);
+
+  // make sure the zoom level has not changed
+  is(
+    win.ZoomManager.zoom,
+    mozillaZoom,
+    "Entering private browsing should not reset the zoom on a tab"
+  );
+
+  // cleanup
+  win.FullZoom.reset();
+  BrowserTestUtils.removeTab(tabMozilla);
+  BrowserTestUtils.removeTab(tabAbout);
+
+  await BrowserTestUtils.closeWindow(win);
+});