Works alright BUT you need a bit of tinkering. Basically, Firefox already has support for profiles. The problem is, you have to go on "about:profiles" and this is NOT user friendly at all. This extension make it so that you have an easy access to these profiles à-la Google Chrome. The catch though, is that you have to follow the little wizard provided by the extension once installed. The wizard makes you install a little program needed for the extension to actually work, otherwise you would see your profiles but clicking on them would not work. You have to create a simple config file to provide the right path to Firefox executable and voilà. Works wonder after that.