http://livehttpheaders.mozdev.org/suggestions.html#c412 Please change the Alt-L shortcut for Mac users! On a Mac you allways have to disable the complete extension if you want to enter an email-address into a form! Mozilla/5.0 (Windows; U; Windows NT 6.0; de; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6