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diff --git a/accessible/tests/browser/events/browser_test_A11yUtils_announce.js b/accessible/tests/browser/events/browser_test_A11yUtils_announce.js
new file mode 100644
index 0000000000..b2848f35c2
--- /dev/null
+++ b/accessible/tests/browser/events/browser_test_A11yUtils_announce.js
@@ -0,0 +1,57 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/* import-globals-from ../../mochitest/role.js */
+loadScripts({ name: "role.js", dir: MOCHITESTS_DIR });
+
+// Check that the browser A11yUtils.announce() function works correctly.
+// Note that this does not use mozilla::a11y::Accessible::Announce and a11y
+// announcement events, as these aren't yet supported on desktop.
+async function runTests() {
+  const alert = document.getElementById("a11y-announcement");
+  let alerted = waitForEvent(EVENT_ALERT, alert);
+  A11yUtils.announce({ raw: "first" });
+  let event = await alerted;
+  const alertAcc = event.accessible;
+  is(alertAcc.role, ROLE_ALERT);
+  ok(!alertAcc.name);
+  is(alertAcc.childCount, 1);
+  is(alertAcc.firstChild.name, "first");
+
+  alerted = waitForEvent(EVENT_ALERT, alertAcc);
+  A11yUtils.announce({ raw: "second" });
+  event = await alerted;
+  ok(!alertAcc.name);
+  is(alertAcc.childCount, 1);
+  is(alertAcc.firstChild.name, "second");
+
+  info("Testing Fluent message");
+  // We need a simple Fluent message here without arguments or attributes.
+  const fluentId = "search-one-offs-with-title";
+  const fluentMessage = await document.l10n.formatValue(fluentId);
+  alerted = waitForEvent(EVENT_ALERT, alertAcc);
+  A11yUtils.announce({ id: fluentId });
+  event = await alerted;
+  ok(!alertAcc.name);
+  is(alertAcc.childCount, 1);
+  is(alertAcc.firstChild.name, fluentMessage);
+
+  info("Ensuring Fluent message is cancelled if announce is re-entered");
+  alerted = waitForEvent(EVENT_ALERT, alertAcc);
+  // This call runs async.
+  let asyncAnnounce = A11yUtils.announce({ id: fluentId });
+  // Before the async call finishes, call announce again.
+  A11yUtils.announce({ raw: "third" });
+  // Wait for the async call to complete.
+  await asyncAnnounce;
+  event = await alerted;
+  ok(!alertAcc.name);
+  is(alertAcc.childCount, 1);
+  // The async call should have been cancelled. If it wasn't, we would get
+  // fluentMessage here instead of "third".
+  is(alertAcc.firstChild.name, "third");
+}
+
+addAccessibleTask(``, runTests);