Editorial: IDBCursor/request in Firefox 77

Author: inexorabletash

index.bs

@@ -4374,7 +4374,7 @@ return [=/this=]'s [=cursor/request=].
 <aside class=advisement>
   &#x1F6A7;
   The {{IDBCursor/request}} attribute is new in this edition.
-  It is supported in Chrome 76 and Edge 79.
+  It is supported in Chrome 76, Edge 79, and Firefox 77.
   &#x1F6A7;
 </aside>