--- a/devtools/server/actors/promises.js
+++ b/devtools/server/actors/promises.js
@@ -186,15 +186,15 @@ var PromisesActor = protocol.ActorClassW
     };
   },
 
   _onWindowReady: expectState("attached", function({ isTopLevel }) {
     if (!isTopLevel) {
       return;
     }
 
-    this._navigationLifetimePool.cleanup();
+    this._navigationLifetimePool.destroy();
     this.dbg.removeAllDebuggees();
     this.dbg.addDebuggees();
   }),
 });
 
 exports.PromisesActor = PromisesActor;