Little Snitch 2.3.4 A firewall protects your computer against unwanted guests from the Internet. But who protects your private data from being sent out* Little Snitch does! As soon as you're connected to the Internet applications can potentially send whatever information they want to wherever they want. Sometimes they do this for good reason on your explicit request. But often they don't. Little Snitch allows you to intercept these unwanted connection attempts and lets you decide how to proceed.