Grab (Drag and drop) this button to your favorites/bookmarks bar in the browser.
Sci-Hub.tw:
Then when you enter any article web page (or its record on Pubmed), click on the Sci-hub button in your bookmarks/favorites bar.
Date of the version 17.06.2019
@All credits go to Dr. Hatem Hosny
Small Help:
In case you have a problem (due to the access restrictions in your country) after clicking the link try to install TorBrowser and repeat the same steps: