Used to work fine, but since update I can not use and am locked out of the sites I used it for..
19/02/19 - I don't seem to be able to reply to your comment below so have edited this post instead.
I have no idea which update, I had not used my laptop for a while. All I know is when I tried to use this it says there are no sites configured. I am unable to access the sites I used it for. When I attempted to roll back to a previous version it removed the add-on completely from my browser. I am using Firefox 65.0 atm.