A new Firefox and Chrome browser extension creates a small button on the right
side of the screen whenever you visit a journal article's web page. If it is
green then it found the article freely and legally available on a pre-print server
or the article was not pay-walled in the first place.
To install the extension simply go the
unpaywall.org site
using Firefox or Chrome and click on the large button.
Once it is installed any time you visit an article it will place the aforementioned button
on the right side of the screen. If green click the button
to get to an open access version of the article. If the button is grey then it was unable to find a
free legal source.
The unpaywall.org FAQ
also refers to Gold and Blue buttons but none of the sites I visited had those.
This article discusses unpaywall.org as well as some other similar sites for
uncovering open access material: chronicle.com.
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