A common problem for parents is whether their children will accidentally discover unsavory content while online - an innocent search for "boobie joke" might get them more than they were expecting. There are lots of programs out there that purport to solve this, but the majority of them simply keep lists of inappropriate websites that you have no control over, which very often have political motives behind the content blocking. Enter a plugin for Firefox called ProCon which puts the control in your hands, so you can decide what is appropriate or not. ProCon allows you to block specific domains and URLs, block words that appear in the page itself, and add sites to a "whitelist" so that they're never blocked. While not the most powerful, it certainly is a step in the right direction and parents who are concerned about their children's viewing habits should definitely give it a try.