diff --git a/api/CrashReportContext.json b/api/CrashReportContext.json
index 0196565d1067ca..6a8ad27bd68f87 100644
--- a/api/CrashReportContext.json
+++ b/api/CrashReportContext.json
@@ -14,7 +14,7 @@
           "chrome_android": "mirror",
           "edge": "mirror",
           "firefox": {
-            "version_added": false
+            "version_added": "preview"
           },
           "firefox_android": "mirror",
           "oculus": "mirror",
@@ -48,7 +48,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": false
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
@@ -83,7 +83,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": false
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
@@ -118,7 +118,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": false
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
diff --git a/api/Window.json b/api/Window.json
index 866a13debb0b02..57bc46cc502173 100644
--- a/api/Window.json
+++ b/api/Window.json
@@ -1075,7 +1075,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": false
+              "version_added": "preview"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",