This browser extension was retired back in 2019, and users are recommended to switch to an alternative. Please see PCGamingWiki for more information.
This GitHub repository contains the official browser extension for PCGamingWiki. You can find more information on the extension on its wiki page.
You can also download the extension from the Chrome Web Store or the Firefox Extension Repository.
Code for this repository is governed by the GPL-2.0, which can be found here.