This add-on has saved me money by letting me know if a book on Amazon is available at the local libraries my wife and I belong to. Jeff Bezos gets enough already from me!

I love Library Extension, and when I emailed them with something that wasn't working, I not only got a reply from the creator, but he fixed the problem. Wow!

I didn't expect to use this extension but I have quite often. It works great.

This extension is the most useful, saving me from having to search our public libraries when looking at a book online, and in any format. Highly recommended.

I love this extension. I've never left a review for an extension before, but I had to for this one: it's super useful, unobtrusive, and does precisely what it claims to do, and no more.

I love this extension, use it very often, and have recommended it to several friends. I wish the option to save/import/export configuration was more prominent in the settings menu as only just discovered it today. It would have made installing the extension across several computers a lot less tedious!

Easy to use and an excellent complement to libby. Found via Cory Doctorow's blog at pluralistic.net. adversarial interoperability at its finest!

This extension is probably the most useful one I have, aside from an ad-blocker. It is so easy to add my libraries, and it saves a ton of time instead of searching in each catalog. Highly recommend!

Magnificent add-on. Wish I'd have found it sooner.

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.

Absolutely brilliant stuff, and unthinkably convenient for something I'd never stopped to consider the possibility of. Earnestly recommending this to everyone I speak to from now on.

Super-useful integration with OverDrive to save money.

Very helpful to see which books are available at my library, but it apparently only looks at title, not author, because I've gotten several hits for books with the same title but not the same book.

Makes everything much more streamline when trying to find books!

I love it so much, but I wish there was a feature for when a book isn't available in your library to send a message asking if they can add it to their collection.

I have 10 or so different library cards, and Library Extension is so incredibly helpful. I love being able to see at a glance whether a certain book is available from any of my libraries, or how long the wait will be. Favorite extension ever.

Saves a lot of time searching library catalogues! Very quick to respond to issues, too.