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diff --git a/browser/base/content/test/webrtc/browser_notification_silencing.js b/browser/base/content/test/webrtc/browser_notification_silencing.js
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+++ b/browser/base/content/test/webrtc/browser_notification_silencing.js
@@ -0,0 +1,231 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const TEST_ROOT = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content/",
+  "https://example.com/"
+);
+const TEST_PAGE = TEST_ROOT + "get_user_media.html";
+
+/**
+ * Tests that the screen / window sharing permission popup offers the ability
+ * for users to silence DOM notifications while sharing.
+ */
+
+/**
+ * Helper function that exercises a specific browser to test whether or not the
+ * user can silence notifications via the display sharing permission panel.
+ *
+ * First, we ensure that notification silencing is disabled by default. Then, we
+ * request screen sharing from the browser, and check the checkbox that
+ * silences notifications. Once screen sharing is established, then we ensure
+ * that notification silencing is enabled. Then we stop sharing, and ensure that
+ * notification silencing is disabled again.
+ *
+ * @param {<xul:browser>} aBrowser - The window to run the test on. This browser
+ *   should have TEST_PAGE loaded.
+ * @return Promise
+ * @resolves undefined - When the test on the browser is complete.
+ */
+async function testNotificationSilencing(aBrowser) {
+  let hasIndicator = Services.wm
+    .getEnumerator("Browser:WebRTCGlobalIndicator")
+    .hasMoreElements();
+
+  let window = aBrowser.ownerGlobal;
+
+  let alertsService = Cc["@mozilla.org/alerts-service;1"]
+    .getService(Ci.nsIAlertsService)
+    .QueryInterface(Ci.nsIAlertsDoNotDisturb);
+  Assert.ok(alertsService, "Alerts Service implements nsIAlertsDoNotDisturb");
+  Assert.ok(
+    !alertsService.suppressForScreenSharing,
+    "Should not be silencing notifications to start."
+  );
+
+  let observerPromise = expectObserverCalled(
+    "getUserMedia:request",
+    1,
+    aBrowser
+  );
+  let promise = promisePopupNotificationShown(
+    "webRTC-shareDevices",
+    null,
+    window
+  );
+  let indicatorPromise = hasIndicator
+    ? Promise.resolve()
+    : promiseIndicatorWindow();
+  await promiseRequestDevice(false, true, null, "screen", aBrowser);
+  await promise;
+  await observerPromise;
+
+  checkDeviceSelectors(["screen"], window);
+
+  let document = window.document;
+
+  // Select one of the windows / screens. It doesn't really matter which.
+  let menulist = document.getElementById("webRTC-selectWindow-menulist");
+  menulist.getItemAtIndex(menulist.itemCount - 1).doCommand();
+
+  let notification = window.PopupNotifications.panel.firstElementChild;
+  Assert.ok(
+    notification.hasAttribute("warninghidden"),
+    "Notification silencing warning message is hidden by default"
+  );
+
+  let checkbox = notification.checkbox;
+  Assert.ok(!!checkbox, "Notification silencing checkbox is present");
+  Assert.ok(!checkbox.checked, "checkbox is not checked by default");
+  checkbox.click();
+  Assert.ok(checkbox.checked, "checkbox now checked");
+  // The orginal behaviour of the checkbox disabled the Allow button. Let's
+  // make sure we're not still doing that.
+  Assert.ok(!notification.button.disabled, "Allow button is not disabled");
+  Assert.ok(
+    notification.hasAttribute("warninghidden"),
+    "No warning message is shown"
+  );
+
+  let observerPromise1 = expectObserverCalled(
+    "getUserMedia:response:allow",
+    1,
+    aBrowser
+  );
+  let observerPromise2 = expectObserverCalled(
+    "recording-device-events",
+    1,
+    aBrowser
+  );
+  await promiseMessage(
+    "ok",
+    () => {
+      notification.button.click();
+    },
+    1,
+    aBrowser
+  );
+  await observerPromise1;
+  await observerPromise2;
+  let indicator = await indicatorPromise;
+
+  Assert.ok(
+    alertsService.suppressForScreenSharing,
+    "Should now be silencing notifications"
+  );
+
+  let indicatorClosedPromise = hasIndicator
+    ? Promise.resolve()
+    : BrowserTestUtils.domWindowClosed(indicator);
+
+  await stopSharing("screen", true, aBrowser, window);
+  await indicatorClosedPromise;
+
+  Assert.ok(
+    !alertsService.suppressForScreenSharing,
+    "Should no longer be silencing notifications"
+  );
+}
+
+add_setup(async function() {
+  // Set prefs so that permissions prompts are shown and loopback devices
+  // are not used. To test the chrome we want prompts to be shown, and
+  // these tests are flakey when using loopback devices (though it would
+  // be desirable to make them work with loopback in future). See bug 1643711.
+  let prefs = [
+    [PREF_PERMISSION_FAKE, true],
+    [PREF_AUDIO_LOOPBACK, ""],
+    [PREF_VIDEO_LOOPBACK, ""],
+    [PREF_FAKE_STREAMS, true],
+    [PREF_FOCUS_SOURCE, false],
+  ];
+
+  await SpecialPowers.pushPrefEnv({ set: prefs });
+});
+
+/**
+ * Tests notification silencing in a normal browser window.
+ */
+add_task(async function testNormalWindow() {
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: TEST_PAGE,
+    },
+    async browser => {
+      await testNotificationSilencing(browser);
+    }
+  );
+});
+
+/**
+ * Tests notification silencing in a private browser window.
+ */
+add_task(async function testPrivateWindow() {
+  let privateWindow = await BrowserTestUtils.openNewBrowserWindow({
+    private: true,
+  });
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser: privateWindow.gBrowser,
+      url: TEST_PAGE,
+    },
+    async browser => {
+      await testNotificationSilencing(browser);
+    }
+  );
+
+  await BrowserTestUtils.closeWindow(privateWindow);
+});
+
+/**
+ * Tests notification silencing when sharing a screen while already
+ * sharing the microphone. Alone ensures that if we stop sharing the
+ * screen, but continue sharing the microphone, that notification
+ * silencing ends.
+ */
+add_task(async function testWhileSharingMic() {
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: TEST_PAGE,
+    },
+    async browser => {
+      let promise = promisePopupNotificationShown("webRTC-shareDevices");
+      let observerPromise = expectObserverCalled("getUserMedia:request");
+      await promiseRequestDevice(true, true);
+      await promise;
+      await observerPromise;
+
+      let indicatorPromise = promiseIndicatorWindow();
+      let observerPromise1 = expectObserverCalled(
+        "getUserMedia:response:allow"
+      );
+      let observerPromise2 = expectObserverCalled("recording-device-events");
+
+      promise = promiseMessage("ok", () => {
+        PopupNotifications.panel.firstElementChild.button.click();
+      });
+      await observerPromise1;
+      await observerPromise2;
+      await promise;
+
+      Assert.deepEqual(
+        await getMediaCaptureState(),
+        { audio: true, video: true },
+        "expected camera and microphone to be shared"
+      );
+
+      let indicator = await indicatorPromise;
+      await checkSharingUI({ audio: true, video: true });
+
+      await testNotificationSilencing(browser);
+
+      let indicatorClosedPromise = BrowserTestUtils.domWindowClosed(indicator);
+      await closeStream();
+      await indicatorClosedPromise;
+    }
+  );
+});