Would it be possible to add an option to the script to recolour Facebook's top-bar/navbar/header/whatever it's called to "Facebook Blue", like it used to be? I'm currently using Stylish to do this, but it feels overkill to use it just for that.

Colour (hex):
#3b5998

Stylish outputs this, but I'm not sure if it's the same for everyone (might need some sort of JS selector?):

ul.thodolrn.ojvp67qx.taijpn5t.buofh1pr.j83agx80.aovydwv3.bqdfd6uv {
  background-color: #3b5998;
  color: #FFFFFF;
}