diff --git a/api/FileSystemWritableFileStream.json b/api/FileSystemWritableFileStream.json
index 1d1d10e9d4e80b..31ebd175d048af 100644
--- a/api/FileSystemWritableFileStream.json
+++ b/api/FileSystemWritableFileStream.json
@@ -13,7 +13,7 @@
           },
           "edge": "mirror",
           "firefox": {
-            "version_added": false
+            "version_added": "111"
           },
           "firefox_android": "mirror",
           "ie": {
@@ -30,7 +30,7 @@
           "webview_android": "mirror"
         },
         "status": {
-          "experimental": true,
+          "experimental": false,
           "standard_track": true,
           "deprecated": false
         }
@@ -48,7 +48,7 @@
             },
             "edge": "mirror",
             "firefox": {
-              "version_added": false
+              "version_added": "111"
             },
             "firefox_android": "mirror",
             "ie": {
@@ -65,7 +65,7 @@
             "webview_android": "mirror"
           },
           "status": {
-            "experimental": true,
+            "experimental": false,
             "standard_track": true,
             "deprecated": false
           }
@@ -84,7 +84,7 @@
             },
             "edge": "mirror",
             "firefox": {
-              "version_added": false
+              "version_added": "111"
             },
             "firefox_android": "mirror",
             "ie": {
@@ -101,7 +101,7 @@
             "webview_android": "mirror"
           },
           "status": {
-            "experimental": true,
+            "experimental": false,
             "standard_track": true,
             "deprecated": false
           }
@@ -120,7 +120,7 @@
             },
             "edge": "mirror",
             "firefox": {
-              "version_added": false
+              "version_added": "111"
             },
             "firefox_android": "mirror",
             "ie": {
@@ -137,7 +137,7 @@
             "webview_android": "mirror"
           },
           "status": {
-            "experimental": true,
+            "experimental": false,
             "standard_track": true,
             "deprecated": false
           }