I am having the same problem. I've been an avid user of EN for quite a while, but have encountered more bugs in the last three months than the previous five years. Safari 12.0 on Mac Pro, extension installed from the website three times today. If it isn't spinning in the middle of the page, it is telling me that I need to reload the page in order to display it.
I would like to request a feature that would allow me to move items in a list up or down and the numbers adjust accordingly. Basically, it would help in prioritizing list items. In a Word outline you can use Shift-Control Up/Down arrow to move items around. It is very handy and would take EN lists up a notch. Thanks for considering it! Wayne