diff --git a/experimenter/experimenter/features/manifests/fenix/.ref-cache.yaml b/experimenter/experimenter/features/manifests/fenix/.ref-cache.yaml
index c5c42cc6ed..0ba69abc4e 100644
--- a/experimenter/experimenter/features/manifests/fenix/.ref-cache.yaml
+++ b/experimenter/experimenter/features/manifests/fenix/.ref-cache.yaml
@@ -1,3 +1,3 @@
-beta: 3e1ed8a759a9d442211839be1f83a4615f0cb644
-master: d8f4a94563b0a28c485f0dbfaf56b92434242d1e
+beta: 1d2c49699acaffa690961417d5ddb7f332264db5
+master: 66aaf96f955d9bdc4bdb087a5075d5fbff2b9c8d
 release: c204af1d49b724b88bc289ea38c4d50a78d133ef
diff --git a/experimenter/experimenter/features/manifests/firefox-desktop/.ref-cache.yaml b/experimenter/experimenter/features/manifests/firefox-desktop/.ref-cache.yaml
index d6f80cf67a..f2eaa6d7d7 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: 5df6b4533d4d31d503001ffad22c208c15dbef32
-central: 3a912704bc24872e037fe3102cd5483ba5105993
+beta: 87c5950960511db3f64a06208ea24bf212638a23
+central: f4d133d6555bf90b949f8d138bb32c88a55c1ceb
 esr115: 7b461b7d80acc34e0193fa0fbed98f71242b388a
-esr128: 1de76ef2e1461d0b2e29b0ca738cc91791346a14
+esr128: 38b1579734e224bc72cddd532877d3b864d7d910
 release: 6ad91dc44daed9cacf53946523ebf99649f04ef5
diff --git a/experimenter/experimenter/features/manifests/firefox-desktop/experimenter.yaml b/experimenter/experimenter/features/manifests/firefox-desktop/experimenter.yaml
index 2b450399bd..f974149a69 100644
--- a/experimenter/experimenter/features/manifests/firefox-desktop/experimenter.yaml
+++ b/experimenter/experimenter/features/manifests/firefox-desktop/experimenter.yaml
@@ -858,6 +858,13 @@ newtabAdSizingExperiment:
         pref: browser.newtabpage.activity-stream.newtabAdSize.leaderboard
       description: >-
         Leaderboard ad size and UI.
+    leaderboard_position:
+      type: string
+      setPref:
+        branch: user
+        pref: browser.newtabpage.activity-stream.newtabAdSize.leaderboard.position
+      description: >-
+        Leaderboard row position.
     billboard:
       type: boolean
       setPref:
@@ -865,6 +872,14 @@ newtabAdSizingExperiment:
         pref: browser.newtabpage.activity-stream.newtabAdSize.billboard
       description: >-
         Billboard ad size and UI.
+    billboard_position:
+      type: string
+      setPref:
+        branch: user
+        pref: browser.newtabpage.activity-stream.newtabAdSize.billboard.position
+      description: >-
+        Billboard row position.
+
 newtabLayoutExperiment:
   description: >-
     Change the default layout of new tab by adjusting sizes and spacing of elements.
diff --git a/experimenter/experimenter/features/manifests/firefox-desktop/schemas/browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json b/experimenter/experimenter/features/manifests/firefox-desktop/schemas/browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json
index 6067f38398..7dc6158eff 100644
--- a/experimenter/experimenter/features/manifests/firefox-desktop/schemas/browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json
+++ b/experimenter/experimenter/features/manifests/firefox-desktop/schemas/browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json
@@ -974,6 +974,10 @@
               "type": "boolean",
               "description": "Show transitions within and between screens"
             },
+            "disableEscClose": {
+              "type": "boolean",
+              "description": "Don't allow the message to be dismissed using the ESC key - for limited use in Spotlight modals only when the message content clearly informs the user that a decision is required to proceed"
+            },
             "disableHistoryUpdates": {
               "type": "boolean",
               "description": "Don't alter the browser session's history stack - used with messaging surfaces like Feature Callouts"
diff --git a/experimenter/experimenter/features/manifests/firefox-desktop/v135.0.0/experimenter.yaml b/experimenter/experimenter/features/manifests/firefox-desktop/v135.0.0/experimenter.yaml
index 2b450399bd..f974149a69 100644
--- a/experimenter/experimenter/features/manifests/firefox-desktop/v135.0.0/experimenter.yaml
+++ b/experimenter/experimenter/features/manifests/firefox-desktop/v135.0.0/experimenter.yaml
@@ -858,6 +858,13 @@ newtabAdSizingExperiment:
         pref: browser.newtabpage.activity-stream.newtabAdSize.leaderboard
       description: >-
         Leaderboard ad size and UI.
+    leaderboard_position:
+      type: string
+      setPref:
+        branch: user
+        pref: browser.newtabpage.activity-stream.newtabAdSize.leaderboard.position
+      description: >-
+        Leaderboard row position.
     billboard:
       type: boolean
       setPref:
@@ -865,6 +872,14 @@ newtabAdSizingExperiment:
         pref: browser.newtabpage.activity-stream.newtabAdSize.billboard
       description: >-
         Billboard ad size and UI.
+    billboard_position:
+      type: string
+      setPref:
+        branch: user
+        pref: browser.newtabpage.activity-stream.newtabAdSize.billboard.position
+      description: >-
+        Billboard row position.
+
 newtabLayoutExperiment:
   description: >-
     Change the default layout of new tab by adjusting sizes and spacing of elements.
diff --git a/experimenter/experimenter/features/manifests/firefox-desktop/v135.0.0/schemas/browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json b/experimenter/experimenter/features/manifests/firefox-desktop/v135.0.0/schemas/browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json
index 6067f38398..7dc6158eff 100644
--- a/experimenter/experimenter/features/manifests/firefox-desktop/v135.0.0/schemas/browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json
+++ b/experimenter/experimenter/features/manifests/firefox-desktop/v135.0.0/schemas/browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json
@@ -974,6 +974,10 @@
               "type": "boolean",
               "description": "Show transitions within and between screens"
             },
+            "disableEscClose": {
+              "type": "boolean",
+              "description": "Don't allow the message to be dismissed using the ESC key - for limited use in Spotlight modals only when the message content clearly informs the user that a decision is required to proceed"
+            },
             "disableHistoryUpdates": {
               "type": "boolean",
               "description": "Don't alter the browser session's history stack - used with messaging surfaces like Feature Callouts"
diff --git a/experimenter/experimenter/features/manifests/focus-ios/.ref-cache.yaml b/experimenter/experimenter/features/manifests/focus-ios/.ref-cache.yaml
index c3f7a6b731..96fa6b6104 100644
--- a/experimenter/experimenter/features/manifests/focus-ios/.ref-cache.yaml
+++ b/experimenter/experimenter/features/manifests/focus-ios/.ref-cache.yaml
@@ -12,7 +12,7 @@ focus/klar-v131.0: 34d92c8df1b1522a1da88c23879b439d763ec133
 focus/klar-v131.1: b7dca2271b14988837524a30eb154d91eb5e4912
 focus/klar-v132.0: d9ed6134db59ff456d343e2bb211aefd040319ac
 focus/klar-v133.0: a3372669a06fa684d3c5945c317d6787e3125303
-main: ab0931efdf2081fca1c05c5b8c27a244b5275d51
+main: 394d238bbc555d3e6c59f9bb672e586b4af58a2b
 release/v124: da250bed9e19c4978d4400d6d404cb312e33636e
 release/v125: a3e1e0773a00009e08d95726fd518ab642255ccd
 release/v126: 6f305409b4af68e8404401a2caad8cb0da9a0494
@@ -23,4 +23,4 @@ release/v130: a48ec1b1f0219e1987bb38bc4f6b838f37dc6f12
 release/v131: 7444df581b62d357df12ddc3c90d821d940efbb8
 release/v132: cb318d0061ec6354167ecc1968020d5d75f1bffc
 release/v133: 5230c008f4c592fb4bf229f435d24dc912d96d16
-release/v134: e037d4f31559220180d38a17117f6fba20ec6d02
+release/v134: 9c03589c19b92066405ccfa66b76686a48d49824
diff --git a/experimenter/experimenter/features/manifests/ios/.ref-cache.yaml b/experimenter/experimenter/features/manifests/ios/.ref-cache.yaml
index 25509ca464..d70ef1f119 100644
--- a/experimenter/experimenter/features/manifests/ios/.ref-cache.yaml
+++ b/experimenter/experimenter/features/manifests/ios/.ref-cache.yaml
@@ -1,4 +1,4 @@
-main: ab0931efdf2081fca1c05c5b8c27a244b5275d51
+main: 394d238bbc555d3e6c59f9bb672e586b4af58a2b
 release/v117: 43b690c450066d4dde1b2ccb93ed3714d244d502
 release/v118: 89a7ea3c3372e5a4ef5b3c5b85499d26198d0524
 release/v119: 7dc381f991c6d2a983c3ba7f0cffd880e8c29e7b
@@ -16,7 +16,7 @@ release/v130: a48ec1b1f0219e1987bb38bc4f6b838f37dc6f12
 release/v131: 7444df581b62d357df12ddc3c90d821d940efbb8
 release/v132: cb318d0061ec6354167ecc1968020d5d75f1bffc
 release/v133: 5230c008f4c592fb4bf229f435d24dc912d96d16
-release/v134: e037d4f31559220180d38a17117f6fba20ec6d02
+release/v134: 9c03589c19b92066405ccfa66b76686a48d49824
 v117.0: 3b275ab1e4ccef769d84437033c0c68acfd2df8a
 v117.1: 55ddcf473a65d106d43f6d2ae5af4076d6d03688
 v117.2: 5cc367aa8857199cd8a54d53e8faf6696c5614c3