console.profile() doesn't seem to like UTF-8. Screenshot: http://i.imgur.com/qQkzB.png Try running this in the Web Inspector console: function foo() { return; } console.profile('ïñtërnâtiônàlizætiøn'); foo(); console.profileEnd('ïñtërnâtiônàlizætiøn'); Note that this works fine in Firebug.