1 files changed, 53 insertions, 0 deletions
diff --git a/browser/base/content/test/general/browser_bug495058.js b/browser/base/content/test/general/browser_bug495058.js
new file mode 100644
index 0000000000..95a444bf6a
--- /dev/null
+++ b/browser/base/content/test/general/browser_bug495058.js
@@ -0,0 +1,53 @@
+/**
+ * Tests that the right elements of a tab are focused when it is
+ * torn out into its own window.
+ */
+
+const URIS = [
+  "about:blank",
+  "about:home",
+  "about:sessionrestore",
+  "about:privatebrowsing",
+];
+
+add_task(async function () {
+  for (let uri of URIS) {
+    let tab = BrowserTestUtils.addTab(gBrowser);
+    BrowserTestUtils.loadURIString(tab.linkedBrowser, uri);
+    await BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+    let isRemote = tab.linkedBrowser.isRemoteBrowser;
+
+    let win = gBrowser.replaceTabWithWindow(tab);
+
+    await TestUtils.topicObserved(
+      "browser-delayed-startup-finished",
+      subject => subject == win
+    );
+    // In the e10s case, we wait for the content to first paint before we focus
+    // the URL in the new window, to optimize for content paint time.
+    if (isRemote) {
+      await win.gBrowserInit.firstContentWindowPaintPromise;
+    }
+
+    tab = win.gBrowser.selectedTab;
+
+    Assert.equal(
+      win.gBrowser.currentURI.spec,
+      uri,
+      uri + ": uri loaded in detached tab"
+    );
+
+    const expectedActiveElement = tab.isEmpty
+      ? win.gURLBar.inputField
+      : win.gBrowser.selectedBrowser;
+    Assert.equal(
+      win.document.activeElement,
+      expectedActiveElement,
+      `${uri}: the active element is expected: ${win.document.activeElement?.nodeName}`
+    );
+    Assert.equal(win.gURLBar.value, "", uri + ": urlbar is empty");
+    Assert.ok(win.gURLBar.placeholder, uri + ": placeholder text is present");
+
+    await BrowserTestUtils.closeWindow(win);
+  }
+});