1 files changed, 47 insertions, 0 deletions
diff --git a/browser/base/content/test/fullscreen/browser_bug1557041.js b/browser/base/content/test/fullscreen/browser_bug1557041.js
new file mode 100644
index 0000000000..3f00de86a0
--- /dev/null
+++ b/browser/base/content/test/fullscreen/browser_bug1557041.js
@@ -0,0 +1,47 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// This test tends to trigger a race in the fullscreen time telemetry,
+// where the fullscreen enter and fullscreen exit events (which use the
+// same histogram ID) overlap. That causes TelemetryStopwatch to log an
+// error.
+SimpleTest.ignoreAllUncaughtExceptions(true);
+
+add_task(async function test_identityPopupCausesFSExit() {
+  let url = "https://example.com/";
+
+  await BrowserTestUtils.withNewTab("about:blank", async browser => {
+    let loaded = BrowserTestUtils.browserLoaded(browser, false, url);
+    BrowserTestUtils.loadURIString(browser, url);
+    await loaded;
+
+    let identityPermissionBox = document.getElementById(
+      "identity-permission-box"
+    );
+
+    info("Entering DOM fullscreen");
+    await changeFullscreen(browser, true);
+
+    let popupShown = BrowserTestUtils.waitForEvent(
+      window,
+      "popupshown",
+      true,
+      event => event.target == document.getElementById("permission-popup")
+    );
+    let fsExit = waitForFullScreenState(browser, false);
+
+    identityPermissionBox.click();
+
+    info("Waiting for fullscreen exit and permission popup to show");
+    await Promise.all([fsExit, popupShown]);
+
+    let identityPopup = document.getElementById("permission-popup");
+    ok(
+      identityPopup.hasAttribute("panelopen"),
+      "Identity popup should be open"
+    );
+    ok(!window.fullScreen, "Should not be in full-screen");
+  });
+});