Depends what you are trying to achieve, if we are talking a simple level about controlling what "side" of yourself your friends see I think the browser plugin i

Depends what you are trying to achieve, if we are talking a simple level about controlling what "side" of yourself your friends see I think the browser plugin is fine. If its about hiding your identity for security reasons then sure its not going to work, and also of course FB could use the techniques outlined to discover when you are doing this and block you.