diff --git a/css/at-rules/page.json b/css/at-rules/page.json
index 120c92c84843da..4e30e031daee3d 100644
--- a/css/at-rules/page.json
+++ b/css/at-rules/page.json
@@ -400,7 +400,7 @@
               "chrome_android": "mirror",
               "edge": "mirror",
               "firefox": {
-                "version_added": "preview"
+                "version_added": "122"
               },
               "firefox_android": "mirror",
               "ie": {