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Do you hate when you buy an eBook on Amazon, only to realize that you had a free copy with your O'Reilly subscription? This… Do you hate when you buy an eBook on Amazon, only to realize that you had a free copy with your O'Reilly subscription? This extension will check if an eBook exists with O'Reilly and place a button for you on the product page that will take you directly to the book. Install and save money today!