After a year of helping Chrome users keep their data private from Facebook, the Facebook Disconnect browser extension is now coming to Safari and Firefox. Facebook Disconnect was created last October when Brian Kennish grew tired of seeing Facebook widgets and "Like" buttons and became concerned about the security of his private data. Within a couple of hours, Kennish had worked up a script for Chrome that solved his problems, and then released it to the world. Initially he looked at it as a small side project, hoping it could gather 50 users — instead, it has 150,000 weekly users after one year. Additionally, the code is open-sourced, so interested parties can use it to build their own custom blocking tools.