diff --git a/experimenter/experimenter/features/manifests/fenix/.ref-cache.yaml b/experimenter/experimenter/features/manifests/fenix/.ref-cache.yaml
index 1645557284..84498d9f41 100644
--- a/experimenter/experimenter/features/manifests/fenix/.ref-cache.yaml
+++ b/experimenter/experimenter/features/manifests/fenix/.ref-cache.yaml
@@ -1,3 +1,3 @@
-beta: e8ff13f25fd65d82e489fa524983731447274cff
-master: 9bbbf735a4fcc5841a77076044ab0aaa4df3a098
-release: 21df1ac521242be96e0c070aa713ccff03e1b2d3
+beta: 6067e49ebe8a2c97a8fa3ac4658cfc93e07fa4db
+master: 2097b2f70189bffff5e19d2a14ec113f7af4f2f3
+release: 8647b34112bf8f1ea2d630feffa0e863e82f79ca
diff --git a/experimenter/experimenter/features/manifests/firefox-desktop/.ref-cache.yaml b/experimenter/experimenter/features/manifests/firefox-desktop/.ref-cache.yaml
index 9a21e140ac..c16abb54d8 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: b091db63175891523c03ced3d3c6f93fa45964e4
-central: f53d61ffefac1a2b4273cc6c2422a9ba77cdd46b
-esr115: d1fc468b22bf1334946ad6565e971199f6bad5c8
-esr128: 50808f99740b34fe72e7dcc4bce2da7b3a9ab3c4
-release: 1bed3c0453cf905787d1f87bf45ddbdfd64253c9
+beta: 2c5efbe4f2188d253242b3754a2fa0f51f8cb6f3
+central: ce0f77cae5a91e2cb4b1ec859117e08aa1182c52
+esr115: 426fa9a488a4be36a6e13f5ba162e0ade2fdb1a0
+esr128: 2c61bffc270d79e75ae614aa30d5fdb4aaead4b9
+release: 61443e6e9a72c37aba0c2b037bf35e016652baad
diff --git a/experimenter/experimenter/features/manifests/focus-ios/.ref-cache.yaml b/experimenter/experimenter/features/manifests/focus-ios/.ref-cache.yaml
index c0478819c3..3a473558bc 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: d855300bf77aa7621f38bf04be521b613764a9d7
+main: c2f5244abba271c755ac46dd7533599dcf7181dd
 release/v124: da250bed9e19c4978d4400d6d404cb312e33636e
 release/v125: a3e1e0773a00009e08d95726fd518ab642255ccd
 release/v126: 6f305409b4af68e8404401a2caad8cb0da9a0494
@@ -27,4 +27,4 @@ release/v132: cb318d0061ec6354167ecc1968020d5d75f1bffc
 release/v133: 7c651ce29e94c6389af7a69ec6b5c44251976e92
 release/v134: 58f809c3c0717fffaef3bf9443b2c1e3e3a86a0f
 release/v135: e3975ecd13d10d5eff51b26b6b894a190716ce74
-release/v136: 9128749e2a5c2ddd026e9850fc2f4c8478dd7b47
+release/v136: 53ecd9275dbbdf51ffdf819aa8a1386597070d8e
diff --git a/experimenter/experimenter/features/manifests/ios/.ref-cache.yaml b/experimenter/experimenter/features/manifests/ios/.ref-cache.yaml
index a27ac089e0..387d286368 100644
--- a/experimenter/experimenter/features/manifests/ios/.ref-cache.yaml
+++ b/experimenter/experimenter/features/manifests/ios/.ref-cache.yaml
@@ -1,4 +1,4 @@
-main: d855300bf77aa7621f38bf04be521b613764a9d7
+main: c2f5244abba271c755ac46dd7533599dcf7181dd
 release/v117: 43b690c450066d4dde1b2ccb93ed3714d244d502
 release/v118: 89a7ea3c3372e5a4ef5b3c5b85499d26198d0524
 release/v119: 7dc381f991c6d2a983c3ba7f0cffd880e8c29e7b
@@ -17,8 +17,8 @@ release/v131: 7444df581b62d357df12ddc3c90d821d940efbb8
 release/v132: cb318d0061ec6354167ecc1968020d5d75f1bffc
 release/v133: 7c651ce29e94c6389af7a69ec6b5c44251976e92
 release/v134: 58f809c3c0717fffaef3bf9443b2c1e3e3a86a0f
-release/v135: 6956b0c98483f9006a6c0e2e021a97d3c8dc92f3
-release/v136: 9128749e2a5c2ddd026e9850fc2f4c8478dd7b47
+release/v135: e3975ecd13d10d5eff51b26b6b894a190716ce74
+release/v136: 53ecd9275dbbdf51ffdf819aa8a1386597070d8e
 v117.0: 3b275ab1e4ccef769d84437033c0c68acfd2df8a
 v117.1: 55ddcf473a65d106d43f6d2ae5af4076d6d03688
 v117.2: 5cc367aa8857199cd8a54d53e8faf6696c5614c3
diff --git a/experimenter/experimenter/features/manifests/ios/v135.1.0/beta.fml.yaml b/experimenter/experimenter/features/manifests/ios/v135.1.0/beta.fml.yaml
index aa19c52a42..ed6eacb3e2 100644
--- a/experimenter/experimenter/features/manifests/ios/v135.1.0/beta.fml.yaml
+++ b/experimenter/experimenter/features/manifests/ios/v135.1.0/beta.fml.yaml
@@ -41,6 +41,13 @@ features:
         description: "If true, we will allow user to use the credit autofill feature"
         type: Boolean
         default: true
+  dark-reader-feature:
+    description: "This property defines if we legacy dark theme code or darkreader should be used to toggle dark mode on/off\n"
+    variables:
+      status:
+        description: "If true, we will allow use dark reader on webpages to toggle dark mode"
+        type: Boolean
+        default: false
   felt-privacy-feature:
     description: The feature that enhances private browsing mode
     variables:
diff --git a/experimenter/experimenter/features/manifests/ios/v135.1.0/developer.fml.yaml b/experimenter/experimenter/features/manifests/ios/v135.1.0/developer.fml.yaml
index d9c91ac283..de95ee4848 100644
--- a/experimenter/experimenter/features/manifests/ios/v135.1.0/developer.fml.yaml
+++ b/experimenter/experimenter/features/manifests/ios/v135.1.0/developer.fml.yaml
@@ -41,6 +41,13 @@ features:
         description: "If true, we will allow user to use the credit autofill feature"
         type: Boolean
         default: true
+  dark-reader-feature:
+    description: "This property defines if we legacy dark theme code or darkreader should be used to toggle dark mode on/off\n"
+    variables:
+      status:
+        description: "If true, we will allow use dark reader on webpages to toggle dark mode"
+        type: Boolean
+        default: true
   felt-privacy-feature:
     description: The feature that enhances private browsing mode
     variables:
diff --git a/experimenter/experimenter/features/manifests/ios/v135.1.0/experimenter.yaml b/experimenter/experimenter/features/manifests/ios/v135.1.0/experimenter.yaml
index eeec26f6e5..6a5759e916 100644
--- a/experimenter/experimenter/features/manifests/ios/v135.1.0/experimenter.yaml
+++ b/experimenter/experimenter/features/manifests/ios/v135.1.0/experimenter.yaml
@@ -39,6 +39,14 @@ credit-card-autofill:
     credit-card-autofill-status:
       type: boolean
       description: "If true, we will allow user to use the credit autofill feature"
+dark-reader-feature:
+  description: "This property defines if we legacy dark theme code or darkreader should be used to toggle dark mode on/off\n"
+  hasExposure: true
+  exposureDescription: ""
+  variables:
+    status:
+      type: boolean
+      description: "If true, we will allow use dark reader on webpages to toggle dark mode"
 felt-privacy-feature:
   description: The feature that enhances private browsing mode
   hasExposure: true
diff --git a/experimenter/experimenter/features/manifests/ios/v135.1.0/release.fml.yaml b/experimenter/experimenter/features/manifests/ios/v135.1.0/release.fml.yaml
index 3e127b9732..860eb5b252 100644
--- a/experimenter/experimenter/features/manifests/ios/v135.1.0/release.fml.yaml
+++ b/experimenter/experimenter/features/manifests/ios/v135.1.0/release.fml.yaml
@@ -41,6 +41,13 @@ features:
         description: "If true, we will allow user to use the credit autofill feature"
         type: Boolean
         default: true
+  dark-reader-feature:
+    description: "This property defines if we legacy dark theme code or darkreader should be used to toggle dark mode on/off\n"
+    variables:
+      status:
+        description: "If true, we will allow use dark reader on webpages to toggle dark mode"
+        type: Boolean
+        default: false
   felt-privacy-feature:
     description: The feature that enhances private browsing mode
     variables: