This extension downloads paywalled papers you can access through your university and sends them to PapersPlz for processing. Your credentials never leave your browser.
To make it work: sign in once on each publisher where you have access (Elsevier/ScienceDirect, Wiley, Springer, Nature…) using Sign in via your institution → your university. Those sessions usually last for weeks in the browser. The extension reuses those cookies when it downloads PDFs.
Most modern universities, including Unizar, use Shibboleth — leave
this empty. If yours uses classic EZproxy, with URLs like
xxxxx.youruni.edu when opening a paper, paste the host suffix here.