diff --git a/api/Element.json b/api/Element.json
index 69b297167b148..41a106f90fccc 100644
--- a/api/Element.json
+++ b/api/Element.json
@@ -5733,40 +5733,6 @@
           }
         }
       },
-      "openOrClosedShadowRoot": {
-        "__compat": {
-          "mdn_url": "https://developer.mozilla.org/docs/Web/API/Element/openOrClosedShadowRoot",
-          "support": {
-            "chrome": {
-              "version_added": false
-            },
-            "chrome_android": "mirror",
-            "edge": "mirror",
-            "firefox": {
-              "version_added": "63",
-              "notes": "Available only to <a href='https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions'>WebExtensions</a>."
-            },
-            "firefox_android": "mirror",
-            "ie": {
-              "version_added": false
-            },
-            "oculus": "mirror",
-            "opera": "mirror",
-            "opera_android": "mirror",
-            "safari": {
-              "version_added": false
-            },
-            "safari_ios": "mirror",
-            "samsunginternet_android": "mirror",
-            "webview_android": "mirror"
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": false,
-            "deprecated": false
-          }
-        }
-      },
       "outerHTML": {
         "__compat": {
           "mdn_url": "https://developer.mozilla.org/docs/Web/API/Element/outerHTML",
diff --git a/webextensions/api/dom.json b/webextensions/api/dom.json
new file mode 100644
index 0000000000000..de0df9c273373
--- /dev/null
+++ b/webextensions/api/dom.json
@@ -0,0 +1,28 @@
+{
+  "webextensions": {
+    "api": {
+      "dom": {
+        "openOrClosedShadowRoot": {
+          "__compat": {
+            "mdn_url": "https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/dom/openOrClosedShadowRoot",
+            "support": {
+              "chrome": {
+                "version_added": "88"
+              },
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "63"
+              },
+              "firefox_android": "mirror",
+              "opera": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror"
+            }
+          }
+        }
+      }
+    }
+  }
+}