Yes, that will also work. However, since that is an actual IP, it will try to contact that host. Of course, unless you are running a webserver on your local machine, it will get denied. Especially if you have a local firewall that "stealths" the ports, your browser has to time-out before it decides there is nothing to load. But using 0.0.0.0 is not an IP it can even try to contact, so I just skips trying to talk to it all together. Not much of a diffrence, but it's a little faster with 0.0.0.0.