I figured there might be a problem installing Dropbox using the .deb file from the website since XFCE doesn't use Nautilus. Some tutorials said that you have to install Nautilus first which I did. But when I installed Dropbox there weren't any problems and it even shows a symbol in the tray without me having to add anything. What I want to know is if installing Nautilus was necessary or not and which file manager I'm using now, Thunar or Nautilus?