diff --git a/app/src/main/java/org/mozilla/fenix/HomeActivity.kt b/app/src/main/java/org/mozilla/fenix/HomeActivity.kt
index 4958fe725..f1da210e4 100644
--- a/app/src/main/java/org/mozilla/fenix/HomeActivity.kt
+++ b/app/src/main/java/org/mozilla/fenix/HomeActivity.kt
@@ -52,6 +52,7 @@ import org.mozilla.fenix.home.intent.SpeechProcessingIntentProcessor
 import org.mozilla.fenix.home.intent.StartSearchIntentProcessor
 import org.mozilla.fenix.library.bookmarks.BookmarkFragmentDirections
 import org.mozilla.fenix.library.history.HistoryFragmentDirections
+import org.mozilla.fenix.perf.HotStartPerformanceMonitor
 import org.mozilla.fenix.search.SearchFragmentDirections
 import org.mozilla.fenix.settings.AboutFragmentDirections
 import org.mozilla.fenix.settings.DefaultBrowserSettingsFragmentDirections
@@ -69,6 +70,8 @@ open class HomeActivity : AppCompatActivity() {
 
     private var sessionObserver: SessionManager.Observer? = null
 
+    private val hotStartMonitor = HotStartPerformanceMonitor()
+
     private val navHost by lazy {
         supportFragmentManager.findFragmentById(R.id.container) as NavHostFragment
     }
@@ -125,6 +128,16 @@ open class HomeActivity : AppCompatActivity() {
         }
     }
 
+    final override fun onRestart() {
+        hotStartMonitor.onRestartFirstMethodCall()
+        super.onRestart()
+    }
+
+    final override fun onPostResume() {
+        super.onPostResume()
+        hotStartMonitor.onPostResumeFinalMethodCall()
+    }
+
     private fun unsetOpenLinksInAPrivateTabIfNecessary() {
         // Toggle off the open_link_in_private_tab pref if we are no longer set as the default browser
         // We do this on a separate thread to alleviate performance issues
diff --git a/app/src/main/java/org/mozilla/fenix/perf/HotStartPerformanceMonitor.kt b/app/src/main/java/org/mozilla/fenix/perf/HotStartPerformanceMonitor.kt
new file mode 100644
index 000000000..8e1577af5
--- /dev/null
+++ b/app/src/main/java/org/mozilla/fenix/perf/HotStartPerformanceMonitor.kt
@@ -0,0 +1,40 @@
+/* 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/. */
+
+package org.mozilla.fenix.perf
+
+import android.os.SystemClock
+import android.util.Log
+
+/**
+ * Monitors and reports elapsed time to complete hot startup of an Activity. Callers are expected
+ * to call the appropriate lifecycle methods at the appropriate times.
+ *
+ * A "hot startup" is when the application moves from the background to the foreground and both the
+ * Application/process and the Activity under measurement are already created.
+ *
+ * Unfortunately, this monitor does not capture the entire duration of hot start because the
+ * framework calls several Android framework methods in the application's process before we are able
+ * to add monitoring code (i.e. the first time our application code is called in onRestart). An
+ * alternative implementation could measure performance from outside the application.
+ *
+ * To see logs from this class, the user must enable VERBOSE logging for the appropriate tag:
+ *   adb shell setprop log.tag.FenixPerf VERBOSE
+ */
+class HotStartPerformanceMonitor {
+
+    private var onRestartMillis: Long = -1
+
+    fun onRestartFirstMethodCall() {
+        onRestartMillis = SystemClock.elapsedRealtime()
+    }
+
+    fun onPostResumeFinalMethodCall() {
+        // If onRestart was never called, this is not a hot start: ignore it.
+        if (onRestartMillis >= 0) {
+            val elapsedMillis = SystemClock.elapsedRealtime() - onRestartMillis
+            Log.v(Performance.TAG, "hot start: $elapsedMillis") // android log to minimize overhead.
+        }
+    }
+}
diff --git a/app/src/main/java/org/mozilla/fenix/perf/Performance.kt b/app/src/main/java/org/mozilla/fenix/perf/Performance.kt
new file mode 100644
index 000000000..ea4bd81f9
--- /dev/null
+++ b/app/src/main/java/org/mozilla/fenix/perf/Performance.kt
@@ -0,0 +1,12 @@
+/* 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/. */
+
+package org.mozilla.fenix.perf
+
+/**
+ * A collection of objects related to app performance.
+ */
+object Performance {
+    const val TAG = "FenixPerf"
+}