Google Chrome no longer shows the WWW sub domain or http and https in the address bar. Google removed these flags and made it so that the only way you enable them again is if you installed their Suspicious Site Reporter extension. Users were not happy with this situation and did not want to install a Google extension just to get back information that they felt should be shown already. One of these users figured out how to show WWW, http, and https again by creating a custom extension that uses the same ID as the. extension from Google. This tricks Google Chrome into thinking their extension is installed and causes the www,
Source: https://www.bleepingcomputer.com/news/software/make-your-own-google-chrome-extension-to-show-www-again/