--- a/browser/base/content/test/general/browser_contextmenu.js
+++ b/browser/base/content/test/general/browser_contextmenu.js
@@ -877,17 +877,17 @@ add_task(function* test_plaintext_sendpa
                     "---",                  null,
                     "context-viewbgimage",  false,
                     "context-selectall",    true,
                     "---",                  null,
                     "context-viewsource",   true,
                     "context-viewinfo",     true
                    ];
   yield test_contextmenu("#test-text", plainTextItems, {
-      onContextMenuShown() {
+      *onContextMenuShown() {
         yield openMenuItemSubmenu("context-sendpagetodevice");
       }
     });
 
   restoreRemoteClients(oldGetter);
 });
 
 add_task(function* test_link_sendlinktodevice() {
@@ -913,17 +913,17 @@ add_task(function* test_link_sendlinktod
      "---",                  null,
      "context-sendlinktodevice", true,
       ["*Foo", true,
        "*Bar", true,
        "---", null,
        "*All Devices", true], null,
     ],
     {
-      onContextMenuShown() {
+      *onContextMenuShown() {
         yield openMenuItemSubmenu("context-sendlinktodevice");
       }
     });
 
   restoreRemoteClients(oldGetter);
 });
 
 add_task(function* test_cleanup() {