Idk, looking at the code, it doesn't look like it does much other than preinstall some useful add-ons and also remove some search providers, among Other privacy things - it also Reskins the about page, code wise there's really nothing different - It's like setting privacy to higher than max.

Best to look through the code to see what it does before you use it. Just a brief skim I've noticed that for some reason it disables WebGL. Not sure why, it doesn't specify a reason. It could completely break some websites.