1 files changed, 15 insertions, 0 deletions
diff --git a/dom/base/test/head.js b/dom/base/test/head.js
new file mode 100644
index 0000000000..2b39f7a7b1
--- /dev/null
+++ b/dom/base/test/head.js
@@ -0,0 +1,15 @@
+async function newFocusedWindow(trigger) {
+  let winPromise = BrowserTestUtils.domWindowOpenedAndLoaded();
+  let delayedStartupPromise = BrowserTestUtils.waitForNewWindow();
+
+  await trigger();
+
+  let win = await winPromise;
+  // New windows get focused after the first paint, see bug 1262946
+  await BrowserTestUtils.waitForContentEvent(
+    win.gBrowser.selectedBrowser,
+    "MozAfterPaint"
+  );
+  await delayedStartupPromise;
+  return win;
+}