diff --git a/experimenter/experimenter/experiments/constants.py b/experimenter/experimenter/experiments/constants.py
index 20be391bc..ea4c7c9f6 100644
--- a/experimenter/experimenter/experiments/constants.py
+++ b/experimenter/experimenter/experiments/constants.py
@@ -581,6 +581,7 @@ class NimbusConstants:
         FIREFOX_132 = "132.!"
         FIREFOX_132_B6 = "132.0b6"
         FIREFOX_133 = "133.!"
+        FIREFOX_133_B8 = "133.0b8"
         FIREFOX_134 = "134.!"
         FIREFOX_135 = "135.!"
         FIREFOX_136 = "136.!"
diff --git a/experimenter/experimenter/nimbus-ui/schema.graphql b/experimenter/experimenter/nimbus-ui/schema.graphql
index 89a1ddced..851282960 100644
--- a/experimenter/experimenter/nimbus-ui/schema.graphql
+++ b/experimenter/experimenter/nimbus-ui/schema.graphql
@@ -294,6 +294,7 @@ enum NimbusExperimentFirefoxVersionEnum {
   FIREFOX_132
   FIREFOX_132_B6
   FIREFOX_133
+  FIREFOX_133_B8
   FIREFOX_134
   FIREFOX_135
   FIREFOX_136
diff --git a/experimenter/experimenter/nimbus-ui/src/types/globalTypes.ts b/experimenter/experimenter/nimbus-ui/src/types/globalTypes.ts
index dbb41df98..4c9e6f1a3 100644
--- a/experimenter/experimenter/nimbus-ui/src/types/globalTypes.ts
+++ b/experimenter/experimenter/nimbus-ui/src/types/globalTypes.ts
@@ -125,6 +125,7 @@ export enum NimbusExperimentFirefoxVersionEnum {
   FIREFOX_132 = "FIREFOX_132",
   FIREFOX_132_B6 = "FIREFOX_132_B6",
   FIREFOX_133 = "FIREFOX_133",
+  FIREFOX_133_B8 = "FIREFOX_133_B8",
   FIREFOX_134 = "FIREFOX_134",
   FIREFOX_135 = "FIREFOX_135",
   FIREFOX_136 = "FIREFOX_136",