diff --git a/api/TrustedHTML.json b/api/TrustedHTML.json
index 044673ca66f435..ea349dd2f638ec 100644
--- a/api/TrustedHTML.json
+++ b/api/TrustedHTML.json
@@ -14,7 +14,7 @@
           "chrome_android": "mirror",
           "edge": "mirror",
           "firefox": {
-            "version_added": "147"
+            "version_added": "preview"
           },
           "firefox_android": "mirror",
           "oculus": "mirror",
@@ -48,7 +48,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": "147"
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
@@ -83,7 +83,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": "147"
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
diff --git a/api/TrustedScript.json b/api/TrustedScript.json
index 471d88ca4d181d..ed50a8ca5ee7b1 100644
--- a/api/TrustedScript.json
+++ b/api/TrustedScript.json
@@ -14,7 +14,7 @@
           "chrome_android": "mirror",
           "edge": "mirror",
           "firefox": {
-            "version_added": "147"
+            "version_added": "preview"
           },
           "firefox_android": "mirror",
           "oculus": "mirror",
@@ -48,7 +48,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": "147"
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
@@ -83,7 +83,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": "147"
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
diff --git a/api/TrustedScriptURL.json b/api/TrustedScriptURL.json
index 486c92fe8fd746..20662d6f5919e4 100644
--- a/api/TrustedScriptURL.json
+++ b/api/TrustedScriptURL.json
@@ -14,7 +14,7 @@
           "chrome_android": "mirror",
           "edge": "mirror",
           "firefox": {
-            "version_added": "147"
+            "version_added": "preview"
           },
           "firefox_android": "mirror",
           "oculus": "mirror",
@@ -48,7 +48,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": "147"
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
@@ -83,7 +83,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": "147"
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
diff --git a/api/TrustedTypePolicy.json b/api/TrustedTypePolicy.json
index d0392e38dd9596..ea83297ee4b9f8 100644
--- a/api/TrustedTypePolicy.json
+++ b/api/TrustedTypePolicy.json
@@ -14,7 +14,7 @@
           "chrome_android": "mirror",
           "edge": "mirror",
           "firefox": {
-            "version_added": "147"
+            "version_added": "preview"
           },
           "firefox_android": "mirror",
           "oculus": "mirror",
@@ -48,7 +48,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": "147"
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
@@ -83,7 +83,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": "147"
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
@@ -118,7 +118,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": "147"
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
@@ -153,7 +153,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": "147"
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
diff --git a/api/TrustedTypePolicyFactory.json b/api/TrustedTypePolicyFactory.json
index 0ed9546135ce75..1d3d86474201eb 100644
--- a/api/TrustedTypePolicyFactory.json
+++ b/api/TrustedTypePolicyFactory.json
@@ -14,7 +14,7 @@
           "chrome_android": "mirror",
           "edge": "mirror",
           "firefox": {
-            "version_added": "147"
+            "version_added": "preview"
           },
           "firefox_android": "mirror",
           "oculus": "mirror",
@@ -48,7 +48,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": "147"
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
@@ -83,7 +83,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": "147"
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
@@ -118,7 +118,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": "147"
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
@@ -153,7 +153,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": "147"
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
@@ -188,7 +188,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": "147"
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
@@ -223,7 +223,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": "147"
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
@@ -258,7 +258,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": "147"
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
@@ -293,7 +293,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": "147"
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
@@ -328,7 +328,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": "147"
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
diff --git a/api/_globals/trustedTypes.json b/api/_globals/trustedTypes.json
index e12ae4863535d6..098492b0e54691 100644
--- a/api/_globals/trustedTypes.json
+++ b/api/_globals/trustedTypes.json
@@ -14,7 +14,7 @@
           "chrome_android": "mirror",
           "edge": "mirror",
           "firefox": {
-            "version_added": "147"
+            "version_added": "preview"
           },
           "firefox_android": "mirror",
           "oculus": "mirror",