Get a link to a free PDF when you view scholarly articles.
Don't you hate hitting paywalls? We'll fix that, with the power of Open Access.
UnPaywall looks for free versions of the article posted elsewhere online ("Green Open Access"). When we find one, you'll get a convenient "PDF" tab on the right of your screen.
The extension uses the oaDOI API to look up open access versions of article (which means it only works for articles that have a DOI). You can get more details on how this works at https://oadoi.org/api. Source code for the extension is at https://github.com/impactstory/unpaywall.