--- a/toolkit/content/widgets/remote-browser.xml
+++ b/toolkit/content/widgets/remote-browser.xml
@@ -304,17 +304,17 @@
         <![CDATA[
           let { frameLoader } = this.QueryInterface(Components.interfaces.nsIFrameLoaderOwner);
           let tabParent = frameLoader.tabParent;
 
           if (!tabParent.hasBeforeUnload) {
             return { permitUnload: true, timedOut: false };
           }
 
-          const kTimeout = 5000;
+          const kTimeout = 1000;
 
           let finished = false;
           let responded = false;
           let permitUnload;
           let id = this._permitUnloadId++;
           let mm = this.messageManager;
           let Services = Components.utils.import("resource://gre/modules/Services.jsm", {}).Services;