That feature never made sense to me and I always disable it on my GNU+Linux, if I encounter it. Almost always when I want to open 2 different file locations, is because I want to copy files from one folder to another and because I am a lazy lad, i'll just do it by drag and drop. This just works perfectly fine with two windows. Not sure what I would need tabs for. But I also don't care if they exist. Maybe some users like them.