If your battle-worn bookcase is groaning under the weight of all the books you've bought online, let us introduce you to a delightful browser extension that you didn’t know you needed.

As CNET reports, Library Extension is a free way to automatically see if the book you’re about to purchase can be checked out from a library (or libraries) near you. After you install it here—for either Chrome or Firefox—click on the tiny stack of books that appears next to your search bar, and choose your state and public libraries from the dropdown menu. Then, search for a book on Amazon, Barnes & Noble, Audible, or Google Books, and a box along the right side of your window will tell you how many copies are available. It also works on Goodreads, so you don’t even have to be committed to buying your next great read for it to come in handy.

If you’re not picky about book formats, you can add digital catalogs from platforms like OverDrive, Hoopla, and Cloud Library in your extension preferences, and your results will list e-book and audiobook copies among the physical ones. Once you’ve found something you’d like to check out, just click “borrow” and the extension will deliver you straight to its corresponding page on the library’s website.

For veteran library patrons, navigating various catalogs to find the perfect novel might seem simple—or even a little like hunting for treasure—but it can overwhelm a novice borrower and make them stick to one-click purchasing on familiar e-commerce sites. Library Extension takes the confusion out of the process, and gives you the opportunity to save some money, too.

Though the extension will only show you books, they’re not the only things you could be borrowing—here are 11 unexpected items you might be able to check out from your local library.

[h/t CNET]