This extension makes your browser load Wikipedia content from 0wikipedia.org instead of wikipedia.org.
ZeroWiki intercepts any request to wikipedia.org and fetches content from 0wikipedia.org instead. It is especially useful for when you can't access Wikipedia for any reason and you don't want to deal with any VPN's or DNS settings.
ZeroWiki uses 0wikipedia.org, a privately owned domain whose whois information can be seen from here: https://whois.icann.org/en/lookup?name=0wikipedia.org. If you do not trust 0wikipedia.org, then I suggest you not use this extension. Also, I suggest you not enter any private information (username, password etc.) on any of the pages fetched from 0wikipedia.org.
Any inconveniences regarding navigation between pages or in-page anchors are caused by 0wikipedia.org itself, since ZeroWiki does not take any action once Wikipedia content is loaded.