diff --git a/app/metrics.yaml b/app/metrics.yaml
index 99b9f52b0223..d4a1482dbe52 100644
--- a/app/metrics.yaml
+++ b/app/metrics.yaml
@@ -595,6 +595,20 @@ experiments_default_browser:
     notification_emails:
       - fenix-core@mozilla.com
     expires: "2021-10-01"
+  menu_toolbar_visible:
+    type: event
+    description: |
+      Set default browser menu was displayed from toolbar menu
+    bugs:
+      - https://github.com/mozilla-mobile/fenix/issues/18855
+    data_reviews:
+      - https://github.com/mozilla-mobile/fenix/pull/18895
+    data_sensitivity:
+      - interaction
+    notification_emails:
+      - fenix-core@mozilla.com
+    expires: "2021-10-01"
+
 toolbar_settings:
   changed_position:
     type: event
diff --git a/app/src/main/java/org/mozilla/fenix/components/metrics/Event.kt b/app/src/main/java/org/mozilla/fenix/components/metrics/Event.kt
index 890203e19e3f..7b406c773959 100644
--- a/app/src/main/java/org/mozilla/fenix/components/metrics/Event.kt
+++ b/app/src/main/java/org/mozilla/fenix/components/metrics/Event.kt
@@ -225,7 +225,7 @@ sealed class Event {
     object OpenedTabSuggestionClicked : Event()
 
     object SetDefaultBrowserToolbarMenuClicked : Event()
-
+    object SetDefaultBrowserToolbarMenuShown : Event()
     // Interaction events with extras
 
     data class TopSiteSwipeCarousel(val page: Int) : Event() {
diff --git a/app/src/main/java/org/mozilla/fenix/components/metrics/GleanMetricsService.kt b/app/src/main/java/org/mozilla/fenix/components/metrics/GleanMetricsService.kt
index c26415afaabf..a92c75d71c8c 100644
--- a/app/src/main/java/org/mozilla/fenix/components/metrics/GleanMetricsService.kt
+++ b/app/src/main/java/org/mozilla/fenix/components/metrics/GleanMetricsService.kt
@@ -200,6 +200,9 @@ private val Event.wrapper: EventWrapper<*>?
         is Event.SetDefaultBrowserToolbarMenuClicked -> EventWrapper<NoExtraKeys>(
             { ExperimentsDefaultBrowser.toolbarMenuClicked.record(it) }
         )
+        is Event.SetDefaultBrowserToolbarMenuShown -> EventWrapper<NoExtraKeys>(
+            { ExperimentsDefaultBrowser.menuToolbarVisible.record(it) }
+        )
         is Event.OpenedBookmark -> EventWrapper<NoExtraKeys>(
             { BookmarksManagement.open.record(it) }
         )
diff --git a/app/src/main/java/org/mozilla/fenix/components/toolbar/DefaultToolbarMenu.kt b/app/src/main/java/org/mozilla/fenix/components/toolbar/DefaultToolbarMenu.kt
index d2a2316704f7..5032db0fd4e0 100644
--- a/app/src/main/java/org/mozilla/fenix/components/toolbar/DefaultToolbarMenu.kt
+++ b/app/src/main/java/org/mozilla/fenix/components/toolbar/DefaultToolbarMenu.kt
@@ -39,6 +39,7 @@ import org.mozilla.fenix.FeatureFlags.tabsTrayRewrite
 import org.mozilla.fenix.HomeActivity
 import org.mozilla.fenix.R
 import org.mozilla.fenix.browser.browsingmode.BrowsingMode
+import org.mozilla.fenix.components.metrics.Event
 import org.mozilla.fenix.experiments.ExperimentBranch
 import org.mozilla.fenix.experiments.Experiments
 import org.mozilla.fenix.ext.asActivity
@@ -624,13 +625,16 @@ open class DefaultToolbarMenu(
         }
     }
     private fun getSetDefaultBrowserItem(): BrowserMenuImageText? {
-        val experiments = context.components.analytics.experiments
+        val analytics = context.components.analytics
+        val experiments = analytics.experiments
         val browsers = BrowsersCache.all(context)
 
         return experiments.withExperiment(Experiments.DEFAULT_BROWSER) { experimentBranch ->
             if (experimentBranch == ExperimentBranch.DEFAULT_BROWSER_TOOLBAR_MENU &&
                 !browsers.isFirefoxDefaultBrowser
             ) {
+                analytics.metrics.track(Event.SetDefaultBrowserToolbarMenuShown)
+
                 return@withExperiment BrowserMenuImageText(
                     label = context.getString(R.string.preferences_set_as_default_browser),
                     imageResource = R.mipmap.ic_launcher
diff --git a/docs/metrics.md b/docs/metrics.md
index 6ea2d18c5e93..041e469cdce1 100644
--- a/docs/metrics.md
+++ b/docs/metrics.md
@@ -143,6 +143,7 @@ In addition to those built-in metrics, the following metrics are added to the pi
 | events.synced_tab_opened |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |An event that indicates that a synced tab was opened.  |[mozilla-mobile/fenix#16727](https://github.com/mozilla-mobile/fenix/pull/16727)||2021-05-10 |2 |
 | events.tab_counter_menu_action |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A tab counter menu item was tapped |[mozilla-mobile/fenix#11533](https://github.com/mozilla-mobile/fenix/pull/11533), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)|<ul><li>item: A string containing the name of the item the user tapped. These items are:    New tab, New private tab, Close tab </li></ul>|2021-07-01 |2 |
 | events.whats_new_tapped |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened the "what's new" page button  |[mozilla-mobile/fenix#5090](https://github.com/mozilla-mobile/fenix/pull/5090), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
+| experiments_default_browser.menu_toolbar_visible |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Set default browser menu was displayed from toolbar menu  |[mozilla-mobile/fenix#18895](https://github.com/mozilla-mobile/fenix/pull/18895)||2021-10-01 |2 |
 | experiments_default_browser.toolbar_menu_clicked |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Set default browser was clicked from toolbar menu  |[mozilla-mobile/fenix#18895](https://github.com/mozilla-mobile/fenix/pull/18895)||2021-10-01 |2 |
 | find_in_page.closed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user closed the find in page UI  |[mozilla-mobile/fenix#1344](https://github.com/mozilla-mobile/fenix/pull/1344#issuecomment-479285010), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
 | find_in_page.opened |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened the find in page UI  |[mozilla-mobile/fenix#1344](https://github.com/mozilla-mobile/fenix/pull/1344#issuecomment-479285010), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |