diff --git a/browser/modules/BrowserUsageTelemetry.jsm b/browser/modules/BrowserUsageTelemetry.jsm
index 283a85813ac3..c991bb64004f 100644
--- a/browser/modules/BrowserUsageTelemetry.jsm
+++ b/browser/modules/BrowserUsageTelemetry.jsm
@@ -37,6 +37,8 @@ XPCOMUtils.defineLazyPreferenceGetter(
   "browser.engagement.recent_visited_origins.expiry"
 );
 
+Cu.importGlobalProperties(["Glean"]);
+
 // The upper bound for the count of the visited unique domain names.
 const MAX_UNIQUE_VISITED_DOMAINS = 100;
 
@@ -341,6 +343,7 @@ let URICountListener = {
       TOTAL_URI_COUNT_NORMAL_AND_PRIVATE_MODE_SCALAR_NAME,
       1
     );
+    Glean.browserEngagement.uriCount.add(1);
 
     if (!shouldCountURI) {
       return;
diff --git a/browser/modules/metrics.yaml b/browser/modules/metrics.yaml
new file mode 100644
index 000000000000..85bc9e5d7b4c
--- /dev/null
+++ b/browser/modules/metrics.yaml
@@ -0,0 +1,63 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Adding a new metric? We have docs for that!
+# https://firefox-source-docs.mozilla.org/toolkit/components/glean/user/new_definitions_file.html
+
+---
+$schema: moz://mozilla.org/schemas/glean/metrics/2-0-0
+
+browser.engagement:
+  active_ticks:
+    type: counter
+    description: |
+      The number of five-second intervals ('ticks') the user was considered
+      'active'.
+
+      'active' means keyboard or mouse interaction with the application.
+      It doesn't take into account whether or not the window has focus or is in
+      the foreground, only if it is receiving these interaction events.
+
+      Migrated from Telemetry's `browser.engagement.active_ticks`.
+    bugs:
+      - https://bugzilla.mozilla.org/show_bug.cgi?id=1376942  # Telemetry
+      - https://bugzilla.mozilla.org/show_bug.cgi?id=1545172  # Telemetry
+      - https://bugzilla.mozilla.org/show_bug.cgi?id=1741674
+    data_reviews:
+      - https://bugzilla.mozilla.org/show_bug.cgi?id=1545172#c8
+    data_sensitivity:
+      - interaction
+    notification_emails:
+      - loines@mozilla.com
+    expires: "100"
+    send_in_pings:
+      - baseline
+      - metrics
+    no_lint:
+      - BASELINE_PING
+
+  uri_count:
+    type: counter
+    description: |
+      The number of total non-unique http(s) URIs visited, including page
+      reloads, after the session has been restored. URIs on minimized or
+      background tabs may also be counted. Private browsing uris are included.
+
+      Migrated from Telemetry's
+      `browser.engagement.total_uri_count_normal_and_private_mode`.
+    bugs:
+      - https://bugzilla.mozilla.org/show_bug.cgi?id=1535169  # Telemetry
+      - https://bugzilla.mozilla.org/show_bug.cgi?id=1741674
+    data_reviews:
+      - https://bugzilla.mozilla.org/show_bug.cgi?id=1535169#c14
+    data_sensitivity:
+      - interaction
+    notification_emails:
+      - loines@mozilla.com
+    expires: "100"
+    send_in_pings:
+      - baseline
+      - metrics
+    no_lint:
+      - BASELINE_PING
diff --git a/browser/modules/test/browser/browser_UsageTelemetry.js b/browser/modules/test/browser/browser_UsageTelemetry.js
index 0bf279b0bf34..c0a7096f6100 100644
--- a/browser/modules/test/browser/browser_UsageTelemetry.js
+++ b/browser/modules/test/browser/browser_UsageTelemetry.js
@@ -26,13 +26,16 @@ const { SessionStore } = ChromeUtils.import(
   "resource:///modules/sessionstore/SessionStore.jsm"
 );
 
+// Glean's here on `window`, but eslint doesn't know that. bug 1715542.
+/* global Glean:false */
+
 // Reset internal URI counter in case URIs were opened by other tests.
 Services.obs.notifyObservers(null, TELEMETRY_SUBSESSION_TOPIC);
 
 /**
  * Get a snapshot of the scalars and check them against the provided values.
  */
-let checkScalars = countsObject => {
+let checkScalars = (countsObject, skipGleanCheck = false) => {
   const scalars = TelemetryTestUtils.getProcessScalars("parent");
 
   // Check the expected values. Scalars that are never set must not be reported.
@@ -90,6 +93,21 @@ let checkScalars = countsObject => {
     countsObject.totalURIsNormalAndPrivateMode,
     "The total URI count for both normal and private mode must match the expected value."
   );
+  if (!skipGleanCheck) {
+    if (countsObject.totalURIsNormalAndPrivateMode == 0) {
+      Assert.equal(
+        Glean.browserEngagement.uriCount.testGetValue(),
+        undefined,
+        "Total URI count reported in Glean must be unset."
+      );
+    } else {
+      Assert.equal(
+        countsObject.totalURIsNormalAndPrivateMode,
+        Glean.browserEngagement.uriCount.testGetValue(),
+        "The total URI count reported in Glean must be as expected."
+      );
+    }
+  }
 };
 
 add_task(async function test_tabsAndWindows() {
@@ -266,18 +284,21 @@ add_task(async function test_subsessionSplit() {
   // must not be reported.
   expectedTotalURIs = 0;
 
-  checkScalars({
-    maxTabs: 4,
-    tabOpenCount: 0,
-    maxWindows: 2,
-    windowsOpenCount: 0,
-    totalURIs: expectedTotalURIs,
-    domainCount: 0,
-    totalUnfilteredURIs: 0,
-    maxTabsPinned: 0,
-    tabPinnedCount: 0,
-    totalURIsNormalAndPrivateMode: expectedTotalURIs,
-  });
+  checkScalars(
+    {
+      maxTabs: 4,
+      tabOpenCount: 0,
+      maxWindows: 2,
+      windowsOpenCount: 0,
+      totalURIs: expectedTotalURIs,
+      domainCount: 0,
+      totalUnfilteredURIs: 0,
+      maxTabsPinned: 0,
+      tabPinnedCount: 0,
+      totalURIsNormalAndPrivateMode: expectedTotalURIs,
+    },
+    true
+  );
 
   // Remove all the extra windows and tabs.
   for (let tab of openedTabs) {
diff --git a/browser/modules/test/browser/browser_UsageTelemetry_private_and_restore.js b/browser/modules/test/browser/browser_UsageTelemetry_private_and_restore.js
index 54ea602a316e..384fb8fdd238 100644
--- a/browser/modules/test/browser/browser_UsageTelemetry_private_and_restore.js
+++ b/browser/modules/test/browser/browser_UsageTelemetry_private_and_restore.js
@@ -4,6 +4,9 @@ const { E10SUtils } = ChromeUtils.import(
 );
 const triggeringPrincipal_base64 = E10SUtils.SERIALIZED_SYSTEMPRINCIPAL;
 
+// Glean's here on `window`, but eslint doesn't know that. bug 1715542.
+/* global Glean:false */
+
 const MAX_CONCURRENT_TABS = "browser.engagement.max_concurrent_tab_count";
 const TAB_EVENT_COUNT = "browser.engagement.tab_open_event_count";
 const MAX_CONCURRENT_WINDOWS = "browser.engagement.max_concurrent_window_count";
@@ -80,6 +83,7 @@ add_task(async function test_privateMode() {
     1,
     "We should include URIs in private mode as part of the actual total URI count."
   );
+  is(Glean.browserEngagement.uriCount.testGetValue(), 1);
 
   // Clean up.
   await BrowserTestUtils.closeWindow(privateWin);
diff --git a/testing/profiles/common/user.js b/testing/profiles/common/user.js
index bf8a875326c3..2c682a6516e7 100644
--- a/testing/profiles/common/user.js
+++ b/testing/profiles/common/user.js
@@ -77,3 +77,6 @@ user_pref("browser.region.network.url", "");
 user_pref("browser.tabs.unloadOnLowMemory", false);
 // Don't pull Top Sites content from the network
 user_pref("browser.topsites.contile.enabled", false);
+// Default Glean to "record but don't report" mode. Docs:
+// https://firefox-source-docs.mozilla.org/toolkit/components/glean/dev/preferences.html
+user_pref("telemetry.fog.test.localhost_port", -1);
diff --git a/toolkit/components/glean/metrics_index.py b/toolkit/components/glean/metrics_index.py
index 82eb6031888f..3f23496da7d1 100644
--- a/toolkit/components/glean/metrics_index.py
+++ b/toolkit/components/glean/metrics_index.py
@@ -18,6 +18,7 @@ metrics_yamls = [
     "browser/base/content/metrics.yaml",
     "gfx/metrics.yaml",
     "toolkit/components/processtools/metrics.yaml",
+    "browser/modules/metrics.yaml",
     "browser/components/metrics.yaml",
 ]
 
diff --git a/toolkit/components/telemetry/pings/TelemetrySession.jsm b/toolkit/components/telemetry/pings/TelemetrySession.jsm
index 7aaa59c7aea3..1ccb61abd1c0 100644
--- a/toolkit/components/telemetry/pings/TelemetrySession.jsm
+++ b/toolkit/components/telemetry/pings/TelemetrySession.jsm
@@ -27,6 +27,8 @@ XPCOMUtils.defineLazyModuleGetters(this, {
   TelemetryScheduler: "resource://gre/modules/TelemetryScheduler.jsm",
 });
 
+Cu.importGlobalProperties(["Glean"]);
+
 const Utils = TelemetryUtils;
 
 const myScope = this;
@@ -1121,6 +1123,7 @@ var Impl = {
     if (needsUpdate) {
       this._sessionActiveTicks++;
       Services.telemetry.scalarAdd("browser.engagement.active_ticks", 1);
+      Glean.browserEngagement.activeTicks.add(1);
     }
   },
 
diff --git a/toolkit/components/telemetry/tests/unit/test_TelemetrySession_activeTicks.js b/toolkit/components/telemetry/tests/unit/test_TelemetrySession_activeTicks.js
index a332da60e070..590eb8190696 100644
--- a/toolkit/components/telemetry/tests/unit/test_TelemetrySession_activeTicks.js
+++ b/toolkit/components/telemetry/tests/unit/test_TelemetrySession_activeTicks.js
@@ -9,6 +9,8 @@ const { TelemetrySession } = ChromeUtils.import(
   "resource://gre/modules/TelemetrySession.jsm"
 );
 
+Cu.importGlobalProperties(["Glean"]);
+
 function tick(aHowMany) {
   for (let i = 0; i < aHowMany; i++) {
     Services.obs.notifyObservers(null, "user-interaction-active");
@@ -44,6 +46,9 @@ add_task(async function test_setup() {
   do_get_profile();
   // Make sure we don't generate unexpected pings due to pref changes.
   await setEmptyPrefWatchlist();
+  // Ensure FOG's init
+  let FOG = Cc["@mozilla.org/toolkit/glean;1"].getService(Ci.nsIFOG);
+  FOG.initializeFOG();
 });
 
 add_task(async function test_record_activeTicks() {
@@ -65,6 +70,7 @@ add_task(async function test_record_activeTicks() {
         "TelemetrySession must record the expected number of active ticks (in scalars)."
       );
     }
+    Assert.equal(Glean.browserEngagement.activeTicks.testGetValue(), expected);
   };
 
   for (let i = 0; i < 3; i++) {