Chrome has it now. Firefox 3.1 and IE 8 will but they’re not out yet. Want it in Firefox 3? Just install the Private Browsing add-on and you’re all set. So, just what is private browsing? Well, it has been nicknamed "porn mode". Basically, whenever you’re in private mode no record of any of your surfing survives the closing of the browser. (Once the new versions of IE and Firefox are released with this feature built in, I plan on recommending that on public computers, this mode is set as default. I’ll blog more about that when the time comes.)