It's a great extension, i didn't get the lightbox to work but after a deep dive in the code i discoverd that when you make a little change in the next file the lightbox works:
com_imagebrowser/views/gallery/tmpl/default.php
switch the 0 to 1 on line 58
switch the 1 to 0 on line 64
I've got the parameter in the component on showing with lightbox.

The only thing I can't get to work is setting the order of the directories.. It seems like it's putting the directories in random order. Someone knows how to solve this?