The URLs are valid from Google Chrome or a Chromebook. Other browsers (Firefox, IE, Edge, Safari, Opera, etc.) won't know what to do with these links.
chrome://plugins/ = Plug-ins
chrome://extensions/ = Extensions
chrome://chrome/ = About Google Chrome
chrome://accessibility/ = Accessibility
chrome://system/ = System Information
chrome://chrome-urls/ = More URLS
I have made a bit.ly Bitlink to this page as bit.ly/2GChrome
chrome://settings/clearBrowserData/ = CLEAR YOUR CACHE from the beginning of time.
chrome://apps/ (not on Chromebook)