==Edit Hosts file==
In general, I replace the A hosts file[http://en.wikipedia.org/wiki/Hosts_file] on my computers is an easy way to block a wide range of domains (ads, malware, etc). This works in Windows and Mac as well, but the file is in a different location. I use found the MVPS hosts file[http://www.mvps.org/winhelp2002/hosts.htm] with a few additions I have madeto be nice, but there are others available. You can also edit the file to add domains to block individually.
In Fedora, the hosts file is located in '/etc/hosts'. To edit or replace the file, you must be logged in as root. SELinux will not allow you to do this, so once you've moved your new hosts file, you have to restore the default security context.
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su -
