diff --git a/api/DocumentPictureInPicture.json b/api/DocumentPictureInPicture.json
index 1b9c9b2a72257d..c4dd34fa2e5c0e 100644
--- a/api/DocumentPictureInPicture.json
+++ b/api/DocumentPictureInPicture.json
@@ -16,7 +16,8 @@
           },
           "edge": "mirror",
           "firefox": {
-            "version_added": false
+            "version_added": "preview",
+            "impl_url": "https://bugzil.la/1858562"
           },
           "firefox_android": "mirror",
           "oculus": "mirror",
@@ -53,7 +54,8 @@
             },
             "edge": "mirror",
             "firefox": {
-              "version_added": false
+              "version_added": "preview",
+              "impl_url": "https://bugzil.la/1858562"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
@@ -90,7 +92,8 @@
             },
             "edge": "mirror",
             "firefox": {
-              "version_added": false
+              "version_added": "preview",
+              "impl_url": "https://bugzil.la/1858562"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
@@ -163,7 +166,8 @@
               },
               "edge": "mirror",
               "firefox": {
-                "version_added": false
+                "version_added": "preview",
+                "impl_url": "https://bugzil.la/1858562"
               },
               "firefox_android": "mirror",
               "oculus": "mirror",
@@ -201,7 +205,8 @@
             },
             "edge": "mirror",
             "firefox": {
-              "version_added": false
+              "version_added": "preview",
+              "impl_url": "https://bugzil.la/1858562"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
diff --git a/api/DocumentPictureInPictureEvent.json b/api/DocumentPictureInPictureEvent.json
index d3ad1f101e9b16..7524f9617b77ed 100644
--- a/api/DocumentPictureInPictureEvent.json
+++ b/api/DocumentPictureInPictureEvent.json
@@ -16,7 +16,8 @@
           },
           "edge": "mirror",
           "firefox": {
-            "version_added": false
+            "version_added": "preview",
+            "impl_url": "https://bugzil.la/1858562"
           },
           "firefox_android": "mirror",
           "oculus": "mirror",
@@ -53,7 +54,8 @@
             },
             "edge": "mirror",
             "firefox": {
-              "version_added": false
+              "version_added": "preview",
+              "impl_url": "https://bugzil.la/1858562"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
@@ -90,7 +92,8 @@
             },
             "edge": "mirror",
             "firefox": {
-              "version_added": false
+              "version_added": "preview",
+              "impl_url": "https://bugzil.la/1858562"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
diff --git a/api/Window.json b/api/Window.json
index 510b261fb8a42e..d2276436837307 100644
--- a/api/Window.json
+++ b/api/Window.json
@@ -1400,7 +1400,8 @@
             },
             "edge": "mirror",
             "firefox": {
-              "version_added": false
+              "version_added": "preview",
+              "impl_url": "https://bugzil.la/1858562"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
diff --git a/css/at-rules/media.json b/css/at-rules/media.json
index 48fce7a81ad2cb..ec9dbdf5ee5ee1 100644
--- a/css/at-rules/media.json
+++ b/css/at-rules/media.json
@@ -573,7 +573,8 @@
                 },
                 "edge": "mirror",
                 "firefox": {
-                  "version_added": false
+                  "version_added": "preview",
+                  "impl_url": "https://bugzil.la/1858562"
                 },
                 "firefox_android": "mirror",
                 "oculus": "mirror",