diff --git a/html/elements/tbody.json b/html/elements/tbody.json
index 906165b8147bb4..43dcc4ad88177a 100644
--- a/html/elements/tbody.json
+++ b/html/elements/tbody.json
@@ -51,7 +51,7 @@
                 "version_added": "12"
               },
               "firefox": {
-                "version_added": false,
+                "version_added": "1",
                 "impl_url": "https://bugzil.la/915"
               },
               "firefox_android": "mirror",
@@ -159,7 +159,7 @@
                 "version_added": "12"
               },
               "firefox": {
-                "version_added": false,
+                "version_added": "1",
                 "impl_url": "https://bugzil.la/2212"
               },
               "firefox_android": "mirror",
@@ -194,7 +194,7 @@
                 "version_added": "12"
               },
               "firefox": {
-                "version_added": false,
+                "version_added": "1",
                 "impl_url": "https://bugzil.la/915"
               },
               "firefox_android": "mirror",