diff --git a/lib/less-browser/index.js b/lib/less-browser/index.js
index f90d2602..af78acf3 100644
--- a/lib/less-browser/index.js
+++ b/lib/less-browser/index.js
@@ -14,9 +14,17 @@ var less;
 var isFileProtocol = /^(file|chrome(-extension)?|resource|qrc|app):/.test(window.location.protocol),
     options = window.less || {};
 
+console.warn("about to apply polyfill " + window.Promise);
+
 // shim Promise if required
 require('promise/polyfill.js');
 
+console.warn("polyfill applied" + window.Promise);
+
+(function() {
+    console.log("am I in strict mode? "+this);
+})();
+
 window.less = less = require('../less')();
 var environment = less.environment,
     FileManager = require("./file-manager")(options, isFileProtocol, less.logger),