diff --git a/app/metrics.yaml b/app/metrics.yaml
index 58b387e5dae8..0bc17713b1fc 100644
--- a/app/metrics.yaml
+++ b/app/metrics.yaml
@@ -223,6 +223,32 @@ events:
     notification_emails:
       - fenix-core@mozilla.com
     expires: "2021-07-01"
+  default_browser_changed:
+    type: event
+    description: |
+      Indicates the default browser was changed
+    bugs:
+      - https://github.com/mozilla-mobile/fenix/issues/18857
+    data_reviews:
+      - https://github.com/mozilla-mobile/fenix/pull/18895
+    data_sensitivity:
+      - interaction
+    notification_emails:
+      - fenix-core@mozilla.com
+    expires: "2021-10-01"
+  toolbar_menu_visible:
+    type: event
+    description: |
+      The 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"
   total_uri_count:
     type: counter
     description: |
@@ -561,6 +587,20 @@ search_shortcuts:
       - fenix-core@mozilla.com
     expires: "2021-08-01"
 
+experiments_default_browser:
+  toolbar_menu_clicked:
+    type: event
+    description: |
+      Set default browser was clicked from toolbar menu
+    bugs:
+      - https://github.com/mozilla-mobile/fenix/issues/18851
+    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 860a3637e539..f883406732d6 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
@@ -224,6 +224,8 @@ sealed class Event {
     object SearchSuggestionClicked : Event()
     object OpenedTabSuggestionClicked : Event()
 
+    object SetDefaultBrowserToolbarMenuClicked : Event()
+    object ToolbarMenuShown : 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 45eb024bbfe5..4f993d7ef794 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
@@ -32,6 +32,7 @@ import org.mozilla.fenix.GleanMetrics.DownloadsMisc
 import org.mozilla.fenix.GleanMetrics.DownloadsManagement
 import org.mozilla.fenix.GleanMetrics.ErrorPage
 import org.mozilla.fenix.GleanMetrics.Events
+import org.mozilla.fenix.GleanMetrics.ExperimentsDefaultBrowser
 import org.mozilla.fenix.GleanMetrics.FindInPage
 import org.mozilla.fenix.GleanMetrics.History
 import org.mozilla.fenix.GleanMetrics.LoginDialog
@@ -192,6 +193,15 @@ private val Event.wrapper: EventWrapper<*>?
             { Events.browserMenuAction.record(it) },
             { Events.browserMenuActionKeys.valueOf(it) }
         )
+        is Event.SetDefaultBrowserToolbarMenuClicked -> EventWrapper<NoExtraKeys>(
+            { ExperimentsDefaultBrowser.toolbarMenuClicked.record(it) }
+        )
+        is Event.ToolbarMenuShown -> EventWrapper<NoExtraKeys>(
+            { Events.toolbarMenuVisible.record(it) }
+        )
+        is Event.ChangedToDefaultBrowser -> EventWrapper<NoExtraKeys>(
+            { Events.defaultBrowserChanged.record(it) }
+        )
         is Event.OpenedBookmark -> EventWrapper<NoExtraKeys>(
             { BookmarksManagement.open.record(it) }
         )
@@ -819,7 +829,6 @@ private val Event.wrapper: EventWrapper<*>?
         is Event.FennecToFenixMigrated -> null
         is Event.AddonInstalled -> null
         is Event.SearchWidgetInstalled -> null
-        is Event.ChangedToDefaultBrowser -> null
         is Event.SyncAuthFromSharedReuse, Event.SyncAuthFromSharedCopy -> null
     }
 
diff --git a/app/src/main/java/org/mozilla/fenix/components/metrics/MetricController.kt b/app/src/main/java/org/mozilla/fenix/components/metrics/MetricController.kt
index 181ff4ea2f6f..b2746326783d 100644
--- a/app/src/main/java/org/mozilla/fenix/components/metrics/MetricController.kt
+++ b/app/src/main/java/org/mozilla/fenix/components/metrics/MetricController.kt
@@ -179,7 +179,7 @@ internal class ReleaseMetricController(
         }
 
         Component.BROWSER_TOOLBAR to ToolbarFacts.Items.MENU -> {
-            metadata?.get("customTab")?.let { Event.CustomTabsMenuOpened }
+            metadata?.get("customTab")?.let { Event.CustomTabsMenuOpened } ?: Event.ToolbarMenuShown
         }
         Component.BROWSER_MENU to BrowserMenuFacts.Items.WEB_EXTENSION_MENU_ITEM -> {
             metadata?.get("id")?.let { Event.AddonsOpenInToolbarMenu(it.toString()) }
diff --git a/app/src/main/java/org/mozilla/fenix/components/toolbar/BrowserToolbarMenuController.kt b/app/src/main/java/org/mozilla/fenix/components/toolbar/BrowserToolbarMenuController.kt
index da48bb067491..45ab1ece00f0 100644
--- a/app/src/main/java/org/mozilla/fenix/components/toolbar/BrowserToolbarMenuController.kt
+++ b/app/src/main/java/org/mozilla/fenix/components/toolbar/BrowserToolbarMenuController.kt
@@ -346,6 +346,7 @@ class DefaultBrowserToolbarMenuController(
                 )
             }
             is ToolbarMenu.Item.SetDefaultBrowser -> {
+                metrics.track(Event.SetDefaultBrowserToolbarMenuClicked)
                 activity.openSetDefaultBrowserOption()
             }
         }
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..66e0d40cc4cf 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
@@ -624,7 +624,8 @@ 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 ->
diff --git a/docs/metrics.md b/docs/metrics.md
index 63602a25b084..e1966716aa77 100644
--- a/docs/metrics.md
+++ b/docs/metrics.md
@@ -133,6 +133,7 @@ In addition to those built-in metrics, the following metrics are added to the pi
 | events.app_received_intent |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The system received an Intent for the HomeActivity. An intent is received an external entity wants to the app to display content. Intents can be received when the app is closed – at which point the app will be opened – or when the app is already opened – at which point the already open app will make changes such as loading a url. This can be used loosely as a heuristic for when the user requested to open the app. The HomeActivity encompasses the home screen and browser screen but may include other screens. This differs from the app_opened probe because it measures all startups, not just cold startup.  |[mozilla-mobile/fenix#11940/](https://github.com/mozilla-mobile/fenix/pull/11940/), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877)|<ul><li>source: The method used to open Fenix. Possible values are `app_icon`, `custom_tab`, `link` or `unknown` </li></ul>|2021-06-01 | |
 | events.browser_menu_action |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A browser menu item was tapped  |[mozilla-mobile/fenix#1214](https://github.com/mozilla-mobile/fenix/pull/1214#issue-264756708), [mozilla-mobile/fenix#5098](https://github.com/mozilla-mobile/fenix/pull/5098#issuecomment-529658996), [mozilla-mobile/fenix#6310](https://github.com/mozilla-mobile/fenix/pull/6310), [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 include:    Settings, Help, Desktop Site toggle on/off, Find in Page,   New Tab, Private Tab, Share, Report Site Issue, Back/Forward button,   Reload Button, Quit, Reader Mode On, Reader Mode Off, Open In app,   Add To Top Sites, Add-ons Manager, Bookmarks, History </li></ul>|2021-07-01 |2 |
 | events.copy_url_tapped |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |An event that indicates that a user has selected copy option when long pressing on url bar.  |[mozilla-mobile/fenix#16915](https://github.com/mozilla-mobile/fenix/pull/16915)||2021-05-10 |2 |
+| events.default_browser_changed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Indicates the default browser was changed  |[mozilla-mobile/fenix#18895](https://github.com/mozilla-mobile/fenix/pull/18895)||2021-10-01 |2 |
 | events.entered_url |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user entered a url  |[mozilla-mobile/fenix#1067](https://github.com/mozilla-mobile/fenix/pull/1067#issuecomment-474598673), [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>autocomplete: A boolean that tells us whether the URL was autofilled by an Autocomplete suggestion </li></ul>|2021-07-01 |2 |
 | events.opened_link |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened a link with Fenix  |[mozilla-mobile/fenix#5975](https://github.com/mozilla-mobile/fenix/pull/5975), [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>mode: The mode the link was opened in. Either 'PRIVATE' or 'NORMAL'. N.B.: this probe may be incorrectly implemented: see https://github.com/mozilla-mobile/fenix/issues/14133 </li></ul>|2021-07-01 |2 |
 | events.performed_search |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user performed a search  |[mozilla-mobile/fenix#1067](https://github.com/mozilla-mobile/fenix/pull/1067#issuecomment-474598673), [mozilla-mobile/fenix#1677](https://github.com/mozilla-mobile/fenix/pull/1677), [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>source: A string that tells us how the user performed the search. Possible values are:  * default.action * default.suggestion * shortcut.action * shortcut.suggestion </li></ul>|2021-07-01 |2 |
@@ -141,7 +142,9 @@ In addition to those built-in metrics, the following metrics are added to the pi
 | events.search_bar_tapped |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user tapped the search bar  |[mozilla-mobile/fenix#1067](https://github.com/mozilla-mobile/fenix/pull/1067#issuecomment-474598673), [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>source: The view the user was on when they initiated the search (For example: `Home` or `Browser`) </li></ul>|2021-07-01 |2 |
 | 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.toolbar_menu_visible |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The browser menu was displayed from toolbar menu  |[mozilla-mobile/fenix#18895](https://github.com/mozilla-mobile/fenix/pull/18895)||2021-10-01 |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.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 |
 | find_in_page.searched_page |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user searched the page  |[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 |