This a wonderful and useful extension! Will save you a lot of money if you are a bookworm like me.

One of the most useful extensions ever! Simple, accurate - and I use it on 3 libraries in my city.

Great extension, works as advertised. Very helpful to see library availability while browsing for books.

Library Extension is great. Performs as advertised... easily and quickly exposing if a book is available in my local library (Philadelphia Free Library... yeah!).

Incredibly useful with my local library, and also with Overdrive. Helps me avoid the tax-avoiding monopoly that is Amazon.

I used to do the library lookup separately. This app has saved me many hours of searching my library database to see if the books are there. And it also allows me to go directly to my library and put the book on hold. Amazing!

Great way to see if a book is in my library's collection. Love how easy it is to use.

Found out about this extension from a Book RIot article. Works flawlessly for me and my library system.

I was impressed when I learned of this extension, but when I started using it, WOW!!! I no longer use the library catalogs as this add-on gives me everything I need, faster and easier. Having cards for several libraries I used to have to search each one individually, but no more. Fantastic App! Wish it worked on mobile devices but having it on Firefox now is great!! Thanks for a Stellar product!