diff --git a/css/selectors/active-view-transition-type.json b/css/selectors/active-view-transition-type.json
index 45fe05a562e4bf..713c9fd346e704 100644
--- a/css/selectors/active-view-transition-type.json
+++ b/css/selectors/active-view-transition-type.json
@@ -16,7 +16,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": false
+              "version_added": "147"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",