Unzip the file and you should have a folder named medium-parser-extension-main.
In Chrome/Edge go to the extensions page (chrome://extensions or edge://extensions).
Enable Developer Mode by clicking the toggle button on the top right side of the browser.
Drag the chrome folder anywhere on the page to import it (do not delete the folder afterward).
Mozilla Firefox
Troubleshooting
This extension pulls the data from webcache.googleusercontent.com; then removes all the scripts and sends back the html and css contents only. It might not work when there is no data from the request.
For archive.is, it simply redirects you with the data.
Please consider a donation if you find this extension helps you daily.
Your contribution allows me to spend more time making this kind of extension/project.