FireSteg

A Firefox add-on that lets you hide files inside images.

Version: 2.0
License: GPL
Operating System: Mac OS X
Homepage: addons.mozilla.org
Developed by: Zach Oakes

FireSteg is a steganography sidebar extension, letting you hide files inside images for covert sharing. In order to use FireSteg you have to install it and then right-click the toolbar to add the button.

The FireSteg addon is cross-platform and it works on Mac OS X, Windows and Linux.