diff --git a/experimenter/experimenter/features/manifests/fenix/.ref-cache.yaml b/experimenter/experimenter/features/manifests/fenix/.ref-cache.yaml
index 424739bb2f..4d61367be9 100644
--- a/experimenter/experimenter/features/manifests/fenix/.ref-cache.yaml
+++ b/experimenter/experimenter/features/manifests/fenix/.ref-cache.yaml
@@ -1,3 +1,3 @@
-beta: 75153cfde804210282110c8bc510441509defbc6
+beta: e289b90fcb24ca498542b8dc18fd7c7509105283
 master: d1fbe983fb7720f0a4aca0e748817af11c1a374e
 release: 21df1ac521242be96e0c070aa713ccff03e1b2d3
diff --git a/experimenter/experimenter/features/manifests/firefox-desktop/.ref-cache.yaml b/experimenter/experimenter/features/manifests/firefox-desktop/.ref-cache.yaml
index e19c8726f9..34751216b7 100644
--- a/experimenter/experimenter/features/manifests/firefox-desktop/.ref-cache.yaml
+++ b/experimenter/experimenter/features/manifests/firefox-desktop/.ref-cache.yaml
@@ -1,5 +1,5 @@
-beta: 2f15bd117dcfcd7ad47a0249d7d67ebb7a098fda
-central: e96db7f2fc84bf31d8081316be884a96496fecb6
+beta: 36794085397b7597a5ac7998f31bbd7c5efe547c
+central: 731d4b2dcdc5955ba826a55077d5d5ba4b8e1ea8
 esr115: d75267771e3d43008d705fc0d5a1c4d66ab59331
 esr128: 85cf2399be228f96a1bf1fed8d55845aa1a44d9a
 release: 1bed3c0453cf905787d1f87bf45ddbdfd64253c9
diff --git a/experimenter/experimenter/features/manifests/firefox-desktop/experimenter.yaml b/experimenter/experimenter/features/manifests/firefox-desktop/experimenter.yaml
index 8b576bf6e5..50cb2363ca 100644
--- a/experimenter/experimenter/features/manifests/firefox-desktop/experimenter.yaml
+++ b/experimenter/experimenter/features/manifests/firefox-desktop/experimenter.yaml
@@ -938,6 +938,27 @@ newtabLayoutExperiment:
       description: >-
         Variant B in layouts experiment.
 
+newtabCustomWallpaper:
+  description: >-
+    Modify the wallpaper selection feature to support user-uploaded custom wallpaper images
+  owner: mcrawford@mozilla.com
+  hasExposure: false
+  variables:
+    uploadWallpaper:
+      type: boolean
+      setPref:
+        branch: user
+        pref: browser.newtabpage.activity-stream.newtabWallpapers.customWallpaper.enabled
+      description: >-
+        Turns on and off ability to upload a custom wallpaper.
+    colorPicker:
+      type: boolean
+      setPref:
+        branch: user
+        pref: browser.newtabpage.activity-stream.newtabWallpapers.customColor.enabled
+      description: >-
+        Turns on and off background color picker.
+
 newtabShortcutsExperiment:
   description: >-
     Adjusting sizes and spacing of new tab shortcuts.
diff --git a/experimenter/experimenter/features/manifests/firefox-desktop/v137.0.0/experimenter.yaml b/experimenter/experimenter/features/manifests/firefox-desktop/v137.0.0/experimenter.yaml
index 8b576bf6e5..50cb2363ca 100644
--- a/experimenter/experimenter/features/manifests/firefox-desktop/v137.0.0/experimenter.yaml
+++ b/experimenter/experimenter/features/manifests/firefox-desktop/v137.0.0/experimenter.yaml
@@ -938,6 +938,27 @@ newtabLayoutExperiment:
       description: >-
         Variant B in layouts experiment.
 
+newtabCustomWallpaper:
+  description: >-
+    Modify the wallpaper selection feature to support user-uploaded custom wallpaper images
+  owner: mcrawford@mozilla.com
+  hasExposure: false
+  variables:
+    uploadWallpaper:
+      type: boolean
+      setPref:
+        branch: user
+        pref: browser.newtabpage.activity-stream.newtabWallpapers.customWallpaper.enabled
+      description: >-
+        Turns on and off ability to upload a custom wallpaper.
+    colorPicker:
+      type: boolean
+      setPref:
+        branch: user
+        pref: browser.newtabpage.activity-stream.newtabWallpapers.customColor.enabled
+      description: >-
+        Turns on and off background color picker.
+
 newtabShortcutsExperiment:
   description: >-
     Adjusting sizes and spacing of new tab shortcuts.
diff --git a/experimenter/experimenter/features/manifests/focus-ios/.ref-cache.yaml b/experimenter/experimenter/features/manifests/focus-ios/.ref-cache.yaml
index cb7728ed02..b9299d0fe4 100644
--- a/experimenter/experimenter/features/manifests/focus-ios/.ref-cache.yaml
+++ b/experimenter/experimenter/features/manifests/focus-ios/.ref-cache.yaml
@@ -14,7 +14,7 @@ focus/klar-v132.0: d9ed6134db59ff456d343e2bb211aefd040319ac
 focus/klar-v133.0: a3372669a06fa684d3c5945c317d6787e3125303
 focus/klar-v134.0: be550d94c2c7bc8b8902cdf7fe542a64e73a381a
 focus/klar-v135.0: c3145564c445d2f7d9e95527e8242c5d21f99cf9
-main: 3474739347e04199b83c801667d0da8395ad8dad
+main: 51e4b572b9fddc122873666882381f0abd1447e6
 release/v124: da250bed9e19c4978d4400d6d404cb312e33636e
 release/v125: a3e1e0773a00009e08d95726fd518ab642255ccd
 release/v126: 6f305409b4af68e8404401a2caad8cb0da9a0494
@@ -27,4 +27,4 @@ release/v132: cb318d0061ec6354167ecc1968020d5d75f1bffc
 release/v133: 7c651ce29e94c6389af7a69ec6b5c44251976e92
 release/v134: 58f809c3c0717fffaef3bf9443b2c1e3e3a86a0f
 release/v135: 8cebfff26286e73b0beb3e12f5b438be11b1d293
-release/v136: 7e8b7286609d4b43a1a76d8da355d7e556e3ce73
+release/v136: 157470abd714b4355a52b77da5ee6205734acbf7
diff --git a/experimenter/experimenter/features/manifests/ios/.ref-cache.yaml b/experimenter/experimenter/features/manifests/ios/.ref-cache.yaml
index 41450b1f25..9a0fa722f1 100644
--- a/experimenter/experimenter/features/manifests/ios/.ref-cache.yaml
+++ b/experimenter/experimenter/features/manifests/ios/.ref-cache.yaml
@@ -1,4 +1,4 @@
-main: 3474739347e04199b83c801667d0da8395ad8dad
+main: 51e4b572b9fddc122873666882381f0abd1447e6
 release/v117: 43b690c450066d4dde1b2ccb93ed3714d244d502
 release/v118: 89a7ea3c3372e5a4ef5b3c5b85499d26198d0524
 release/v119: 7dc381f991c6d2a983c3ba7f0cffd880e8c29e7b
@@ -18,7 +18,7 @@ release/v132: cb318d0061ec6354167ecc1968020d5d75f1bffc
 release/v133: 7c651ce29e94c6389af7a69ec6b5c44251976e92
 release/v134: 58f809c3c0717fffaef3bf9443b2c1e3e3a86a0f
 release/v135: 8cebfff26286e73b0beb3e12f5b438be11b1d293
-release/v136: 7e8b7286609d4b43a1a76d8da355d7e556e3ce73
+release/v136: 157470abd714b4355a52b77da5ee6205734acbf7
 v117.0: 3b275ab1e4ccef769d84437033c0c68acfd2df8a
 v117.1: 55ddcf473a65d106d43f6d2ae5af4076d6d03688
 v117.2: 5cc367aa8857199cd8a54d53e8faf6696c5614c3
diff --git a/experimenter/experimenter/features/manifests/monitor-web/experimenter.yaml b/experimenter/experimenter/features/manifests/monitor-web/experimenter.yaml
index 3a8942efcb..7fdd196659 100644
--- a/experimenter/experimenter/features/manifests/monitor-web/experimenter.yaml
+++ b/experimenter/experimenter/features/manifests/monitor-web/experimenter.yaml
@@ -15,6 +15,17 @@ data-privacy-petition-banner:
     enabled:
       type: boolean
       description: If the feature is enabled
+example-feature:
+  description: An example feature
+  hasExposure: true
+  exposureDescription: ""
+  variables:
+    enabled:
+      type: boolean
+      description: If the feature is enabled
+    something:
+      type: string
+      description: Another variable
 landing-page-free-scan-cta:
   description: Landing page free scan CTA
   hasExposure: true
diff --git a/experimenter/experimenter/features/manifests/monitor-web/local.fml.yaml b/experimenter/experimenter/features/manifests/monitor-web/local.fml.yaml
index 8ee62c5cdb..c9b6fda023 100644
--- a/experimenter/experimenter/features/manifests/monitor-web/local.fml.yaml
+++ b/experimenter/experimenter/features/manifests/monitor-web/local.fml.yaml
@@ -19,6 +19,17 @@ features:
         description: If the feature is enabled
         type: Boolean
         default: true
+  example-feature:
+    description: An example feature
+    variables:
+      enabled:
+        description: If the feature is enabled
+        type: Boolean
+        default: true
+      something:
+        description: Another variable
+        type: Option<String>
+        default: ~
   landing-page-free-scan-cta:
     description: Landing page free scan CTA
     variables:
diff --git a/experimenter/experimenter/features/manifests/monitor-web/production.fml.yaml b/experimenter/experimenter/features/manifests/monitor-web/production.fml.yaml
index ffaa83795a..5bbcbd1a01 100644
--- a/experimenter/experimenter/features/manifests/monitor-web/production.fml.yaml
+++ b/experimenter/experimenter/features/manifests/monitor-web/production.fml.yaml
@@ -19,6 +19,17 @@ features:
         description: If the feature is enabled
         type: Boolean
         default: false
+  example-feature:
+    description: An example feature
+    variables:
+      enabled:
+        description: If the feature is enabled
+        type: Boolean
+        default: false
+      something:
+        description: Another variable
+        type: Option<String>
+        default: ~
   landing-page-free-scan-cta:
     description: Landing page free scan CTA
     variables:
diff --git a/experimenter/experimenter/features/manifests/monitor-web/staging.fml.yaml b/experimenter/experimenter/features/manifests/monitor-web/staging.fml.yaml
index b3fe815ad6..502507dac8 100644
--- a/experimenter/experimenter/features/manifests/monitor-web/staging.fml.yaml
+++ b/experimenter/experimenter/features/manifests/monitor-web/staging.fml.yaml
@@ -19,6 +19,17 @@ features:
         description: If the feature is enabled
         type: Boolean
         default: false
+  example-feature:
+    description: An example feature
+    variables:
+      enabled:
+        description: If the feature is enabled
+        type: Boolean
+        default: false
+      something:
+        description: Another variable
+        type: Option<String>
+        default: ~
   landing-page-free-scan-cta:
     description: Landing page free scan CTA
     variables: