diff --git a/app/src/main/res/raw/initial_experiments.json b/app/src/main/res/raw/initial_experiments.json
index 29a20bc5f..5dc81c4d6 100644
--- a/app/src/main/res/raw/initial_experiments.json
+++ b/app/src/main/res/raw/initial_experiments.json
@@ -220,6 +220,163 @@
       "localizations": null,
       "locales": null,
       "publishedDate": "2024-02-01T19:06:38.368231Z"
+    },
+    {
+      "schemaVersion": "1.12.0",
+      "slug": "android-optimize-set-as-default-browser-screen",
+      "id": "android-optimize-set-as-default-browser-screen",
+      "arguments": {},
+      "application": "org.mozilla.fenix",
+      "appName": "fenix",
+      "appId": "org.mozilla.fenix",
+      "channel": "nightly",
+      "userFacingName": "Android - Optimize “Set as Default Browser” Screen",
+      "userFacingDescription": "This experiment is designed to optimize the set-to-default browser experience on Android.",
+      "isEnrollmentPaused": false,
+      "isRollout": false,
+      "bucketConfig": {
+        "randomizationUnit": "nimbus_id",
+        "namespace": "fenix-juno-onboarding-nightly-2",
+        "start": 0,
+        "count": 10000,
+        "total": 10000
+      },
+      "featureIds": [
+        "juno-onboarding"
+      ],
+      "probeSets": [],
+      "outcomes": [
+        {
+          "slug": "onboarding",
+          "priority": "primary"
+        },
+        {
+          "slug": "default-browser",
+          "priority": "secondary"
+        }
+      ],
+      "branches": [
+        {
+          "slug": "control",
+          "ratio": 1,
+          "feature": {
+            "featureId": "this-is-included-for-mobile-pre-96-support",
+            "enabled": false,
+            "value": {}
+          },
+          "features": [
+            {
+              "featureId": "juno-onboarding",
+              "enabled": true,
+              "value": {}
+            }
+          ]
+        },
+        {
+          "slug": "treatment-a",
+          "ratio": 1,
+          "feature": {
+            "featureId": "this-is-included-for-mobile-pre-96-support",
+            "enabled": false,
+            "value": {}
+          },
+          "features": [
+            {
+              "featureId": "juno-onboarding",
+              "enabled": true,
+              "value": {
+                "cards": {
+                  "default-browser": {
+                    "enabled": false
+                  }
+                }
+              }
+            }
+          ]
+        },
+        {
+          "slug": "treatment-b",
+          "ratio": 1,
+          "feature": {
+            "featureId": "this-is-included-for-mobile-pre-96-support",
+            "enabled": false,
+            "value": {}
+          },
+          "features": [
+            {
+              "featureId": "juno-onboarding",
+              "enabled": true,
+              "value": {
+                "cards": {
+                  "default-browser": {
+                    "title": "juno_onboarding_default_browser_title_nimbus_3",
+                    "body": "juno_onboarding_default_browser_description_nimbus_4"
+                  }
+                }
+              }
+            }
+          ]
+        },
+        {
+          "slug": "treatment-c",
+          "ratio": 1,
+          "feature": {
+            "featureId": "this-is-included-for-mobile-pre-96-support",
+            "enabled": false,
+            "value": {}
+          },
+          "features": [
+            {
+              "featureId": "juno-onboarding",
+              "enabled": true,
+              "value": {
+                "cards": {
+                  "default-browser": {
+                    "title": "juno_onboarding_default_browser_title_nimbus_4",
+                    "body": "",
+                    "image-res": "ic_onboarding_key_features"
+                  }
+                }
+              }
+            }
+          ]
+        },
+        {
+          "slug": "treatment-d",
+          "ratio": 1,
+          "feature": {
+            "featureId": "this-is-included-for-mobile-pre-96-support",
+            "enabled": false,
+            "value": {}
+          },
+          "features": [
+            {
+              "featureId": "juno-onboarding",
+              "enabled": true,
+              "value": {
+                "cards": {
+                  "default-browser": {
+                    "title": "juno_onboarding_default_browser_title_nimbus_4",
+                    "body": "juno_onboarding_default_browser_description_nimbus_5",
+                    "image-res": "ic_onboarding_key_features_icons_only"
+                  }
+                }
+              }
+            }
+          ]
+        }
+      ],
+      "targeting": "((is_already_enrolled) || ((isFirstRun == 'true') && (app_version|versionCompare('124.!') >= 0) && (language in ['en'])))",
+      "startDate": "2024-03-08",
+      "enrollmentEndDate": null,
+      "endDate": null,
+      "proposedDuration": 35,
+      "proposedEnrollment": 21,
+      "referenceBranch": "control",
+      "featureValidationOptOut": false,
+      "localizations": null,
+      "locales": null,
+      "publishedDate": "2024-03-08T16:48:36.645956Z"
     }
   ]
 }