This is an unobtrusive, well-designed, thoroughly useful add-on. Oh, and it does real good in the world: saves you money, directs more attention to the world's beautiful public libraries, and puts one small roadblock in the way of Amazon world domination.

Automagically and without my asking seamlessly showed that a book I am looking at on Amazon is available in my library. Saved my having to go through a few extra steps to get there.

So glad to have this app as it saves me from buying books that are available in my library or on Scrbd rather than Amazon

Man this little app has changed my life & saved me so much time (especially since NYPL makes you log in EVERY time to do a search). Thank you!!

Edit:

2022-
Still an amazing team. Replies in a flash to any queries or issues you have

2021 - Amazing Team, responds to any issues you have and updates the app in the next few days. Wonderful app that really helps you find the books you have available in your selections.

very helpful as are the people who answer questions for this addin

Very useful for looking up books on Amazon or Goodreads. I had to get 2 URLs fixed for libraries in Brisbane region but then they worked fine.

Very cleanly integrates into websites like Amazon and Goodreads with minimal intrusion and almost no setup necessary. Useful as a reader and someone who hates obnoxious clutter from extensions.

This add-on makes finding books you wish to read but not purchase a breeze. Love it

This is a terrific idea, really well executed. Initially I found it didn't work for my local library, and (to my amazement) when I contacted Library Extension support, it was fixed within a day.

This is such a wonderful convenience. I use it constantly.

Smashing add-on for readers and students. The tedium of going to the library website and investigating availability is over. I use this both from organic and context-menu search results to view two libraries' results at once to see how I can get the book or download fastest. If you can read this, you need this extension.

It's so convenient to see my libraries' holdings when visiting Amazon or Goodreads! I listed two libraries as well as Hoopla. The plug-in's response is very fast.

I had a technical support question and was answered within the hour! I'm very appreciative.

This is by far the most useful extension I've ever downloaded.