this is an awesome alternative to the rickroullete chrome extension on firefox and best of all it is opensource and unlike smacOS or windOWS (you should use linux / openBSD anyways ) it allows you to view its source code to make sure there are no viruses / spyware on it and the best part is that your vi..... i mean client (anyone who you want to prank ) will have no idea it is even there since most of the time it does not insert a rickroll perfect for telling firefox newbyes (or having it preinstalled if people ask you to help install linux for them ) to install it to fix some firefox problem (or are im the weird one there ??? )