Open a new instance of a pdf file with zathura

I love zathura to read my PDF but there is an important feature I am missing. How can I open a copy on the current file (in another instance of zathura)? Thanks for your help! **Update (solution):** For my version of zathura (zathura 0.5.2), I just need to add the line

map  exec "zathura $FILE"

In .config/zathura/zathurarc I thanks renzev whose commentary helped me a lot to find this solution!