I cannot love this extension enough! It is often able to find books that I can't even find by searching for them IN my library catalogue! Recently my library changed systems and my beloved Library Extension stopped working. Crushed, desperate, but not really hopeful, I sent a help request to the team. TO MY SHOCK they fixed it and sent me a note back that all was up and running again!! If you're an avid reader, but prefer to reduce and reuse, saving Amazon purchases for the rare times you must, this extension is invaluable.