Firefox/Chrome extension that gives you a link to a free PDF when you view scholarly articles
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Frontend for the Unpaywall project, a set of tools built to index, find, and deliver OA versions of scholarly articles.

This repo includes the Chrome/Firefox extension, and the website which includes documentation for the extension, the underlying database, and the API.

The repo for the backend code is here (Unpaywall used to be called oadoi and we haven't gotten around to renaming the repo yet).