It seems the functionality of tab reloading is there and is working as expected. HOWEVER, the GUI does not show the actual parameters, at least not in Firefox 56. That is, you can SET the parameters, but you cannot READ them. The displayed settings are just empty or wrong.

This is a major bug and my reason to vote one star only instead of five.

Unfortunately the last change has been made in December 2016, so I am not really optimistic that a fix is imminent. :-(