diff --git a/api/PerformancePaintTiming.json b/api/PerformancePaintTiming.json
index 631303084c4951..2b4056bb6c8df1 100644
--- a/api/PerformancePaintTiming.json
+++ b/api/PerformancePaintTiming.json
@@ -14,10 +14,10 @@
             "version_added": "≤79"
           },
           "firefox": {
-            "version_added": null
+            "version_added": "84"
           },
           "firefox_android": {
-            "version_added": null
+            "version_added": "84"
           },
           "ie": {
             "version_added": false