diff --git a/api/Document.json b/api/Document.json
index f67f62009a1166..f316924ec74585 100644
--- a/api/Document.json
+++ b/api/Document.json
@@ -3395,10 +3395,10 @@
                 "version_added": "≤79"
               },
               "firefox": {
-                "version_added": true
+                "version_added": "10"
               },
               "firefox_android": {
-                "version_added": true
+                "version_added": "10"
               },
               "ie": {
                 "version_added": false