I need to change my rating and opinion on this. I still like mini player, same as flip horizontally and hide end screens. But reverse the order of a playlist is not working how I wanted it to work. In fact, it's practically not working, because I do not see any icon, nor in player or playlist and also as I now understand, it's only working with pop-up player, which is not working either.

So yeah. For mini player, flip horizontally and hide end screens, this add-on gets two stars, but the rest have no practical use for me or are not working.