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.

A great addition...when it works. Sometimes it shows multi-library service such as Colorado's Prospector as having nothing available, but when I check further it is available. But overall, this is a super service...sorry, Amazon!

Useful extension. Although the "Internet archive open library" link more times than not, even thought it says there's a copy, there isn't.

A great add-on that could be even greater if the library definitions one selects would also imply their inter-library loan systems. Colorado libraries use a system called "Prospector" that rummages through other systems in the state including university libraries, etc. If the Extension library definitions could somehow pull in the inter-library systems as well, that would make a great add-on even better! I'm pushing my luck here, but since there's an exhaustible list of libraries to choose from in the extension, perhaps a "nearest availability" option where, when a book isn't available from the chosen list then the next best/nearest availability option could be shown?