This is the best software for filtering websites you don't want to accidentally browse. Blue Coat keeps an update on this software you will never have to worry about any new updates if you unless have it disabled. You can also use it as a free anti-virus program, child filtering program, anti-procrastination, and preventing yourself from ever accessing any dangerous / harmful websites. The best part about this software is that it's free to use. Here's a video I have found explaining you how to use the software.