diff --git a/devtools/client/framework/test/browser_toolbox_dynamic_registration.js b/devtools/client/framework/test/browser_toolbox_dynamic_registration.js
index 779274a7afaa..8b89a88701fd 100644
--- a/devtools/client/framework/test/browser_toolbox_dynamic_registration.js
+++ b/devtools/client/framework/test/browser_toolbox_dynamic_registration.js
@@ -26,6 +26,7 @@ function testRegister(aToolbox)
     inMenu: true,
     isTargetSupported: () => true,
     build: function () {},
+    key: "t"
   });
 }
 
@@ -44,6 +45,8 @@ function toolRegistered(event, toolId)
   ok(panel, "new tool's panel exists in toolbox UI");
 
   for (let win of getAllBrowserWindows()) {
+    let key = win.document.getElementById("key_" + toolId);
+    ok(key, "key for new tool added to every browser window");
     let menuitem = win.document.getElementById("menuitem_" + toolId);
     ok(menuitem, "menu item of new tool added to every browser window");
   }
@@ -83,6 +86,8 @@ function toolUnregistered(event, toolId)
   ok(!panel, "tool's panel was removed from toolbox UI");
 
   for (let win of getAllBrowserWindows()) {
+    let key = win.document.getElementById("key_" + toolId);
+    ok(!key, "key removed from every browser window");
     let menuitem = win.document.getElementById("menuitem_" + toolId);
     ok(!menuitem, "menu item removed from every browser window");
   }