diff --git a/api/Clipboard.json b/api/Clipboard.json
index 6f7de9627ca988..24f4f067e93137 100644
--- a/api/Clipboard.json
+++ b/api/Clipboard.json
@@ -37,6 +37,7 @@
       "clipboardchange_event": {
         "__compat": {
           "description": "`clipboardchange` event",
+          "mdn_url": "https://developer.mozilla.org/docs/Web/API/Clipboard/clipboardchange_event",
           "spec_url": "https://w3c.github.io/clipboard-apis/#eventdef-globaleventhandlers-clipboardchange",
           "tags": [
             "web-features:clipboardchange"
diff --git a/api/InstallEvent.json b/api/InstallEvent.json
index a4b1d827f1727d..a85bce2ed22db3 100644
--- a/api/InstallEvent.json
+++ b/api/InstallEvent.json
@@ -16,21 +16,19 @@
             "version_added": "17"
           },
           "firefox": {
-            "version_added": "44"
+            "version_added": false
           },
           "firefox_android": "mirror",
           "oculus": "mirror",
           "opera": "mirror",
           "opera_android": "mirror",
           "safari": {
-            "version_added": "11.1"
+            "version_added": false
           },
           "safari_ios": "mirror",
           "samsunginternet_android": "mirror",
           "webview_android": "mirror",
-          "webview_ios": {
-            "version_added": false
-          }
+          "webview_ios": "mirror"
         },
         "status": {
           "experimental": false,
diff --git a/api/ServiceWorkerGlobalScope.json b/api/ServiceWorkerGlobalScope.json
index fbba80bb7c6b24..7148a2ed21ba28 100644
--- a/api/ServiceWorkerGlobalScope.json
+++ b/api/ServiceWorkerGlobalScope.json
@@ -528,7 +528,8 @@
               "version_added": "17"
             },
             "firefox": {
-              "version_added": "44"
+              "version_added": "44",
+              "notes": "The `install` event handler is called with an `ExtendableEvent`, not an `InstallEvent`."
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
@@ -539,7 +540,8 @@
               "version_added": "24"
             },
             "safari": {
-              "version_added": "11.1"
+              "version_added": "11.1",
+              "notes": "Returns `ExtendableEvent` instead of `InstallEvent`."
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",