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.

You will need to copy and paste the bold text (example: chrome://settings/clearBrowserData/) into a browser page, as Google Sites invalidates these links.

chrome://flags/ = find Enable fast tab/windows close. This option speeds up Chrome by allowing it to close windows separate to any JavaScript code that might be running.
chrome://plugins/ = Plug-ins
chrome://extensions/ = Extensions
chrome://chrome/ = About Google Chrome
chrome://accessibility/ = Accessibility
chrome://bookmarks/
chrome://cache/
chrome://downloads/
chrome://flash/
chrome://system/ = System Information
chrome://chrome-urls/ = More URLS

I have made a bit.ly Bitlink to this page as bit.ly/2GChrome