Works very well except for one quirk: It refuses to save my library info between FF sessions. I can enter the info and so long as I keep a FF session open the info is retained so I will see if my library has a book I am looking at in AMZ or B&N etc. But as soon as I completely close all FF sessions the info is lost and needs to be reentered the next time I need it. Yet this same problem does not occur in the chromium version. This is very annoying because FF is my primary browser for 99% of usage, I use chromium based ones only when required by other software or sites.

If they fixed this quirk this would be a 5* rating.