About this extension

When you view a paywalled scholarly article, Unpaywall automatically checks its open database of 16 million legal, open-access articles. If there's an open version somewhere, you'll see a green tab on the article. Click the tab and read for free, legally!

Unpaywall is a free, open-source project from Impactstory, a nonprofit dedicated to making scholarly research more open, accessible, and reusable.

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Release notes for 3.91

find dois on cairn.info
improving DOI detection from meta tags
fix doi detection on psycnet.apa.org
avoid checking hostname/undefined when no PDF URL is found

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