Add link regarding maxActions Firefox support

Author: hsubox76

packages/messaging/src/controllers/sw-controller.test.ts

@@ -277,7 +277,8 @@ describe('SwController', () => {
     });
 
     it('warns if there are more action buttons than the browser limit', async () => {
-      // This doesn't exist on Firefox.
+      // This doesn't exist on Firefox:
+      // https://developer.mozilla.org/en-US/docs/Web/API/notification/maxActions
       if (!Notification.maxActions) {
         return;
       }

packages/messaging/src/controllers/sw-controller.ts

@@ -340,6 +340,7 @@ function showNotification(details: NotificationDetails): Promise<void> {
 
   const { actions } = details;
   // Note: Firefox does not support the maxActions property.
+  // https://developer.mozilla.org/en-US/docs/Web/API/notification/maxActions
   const { maxActions } = Notification;
   if (actions && maxActions && actions.length > maxActions) {
     console.warn(