• https://www.chromium.org/administrators/linux-quick-start
• https://www.chromium.org/administrators/policy-list-3

/etc/opt/chrome/policies/managed/policies.json:

policies.json

{
  "ExtensionAllowedTypes": [
    "extension"
  ],
  "ExtensionInstallBlacklist": [
    "*"
  ],
  "ExtensionInstallWhitelist": [
    "cjpalhdlnbpafiamejdnhcphjbkeiagm",
    "mfidmkgnfgnkihnjeklbekckimkipmoe"
  ],
  "ExtensionInstallForcelist": [
    "cjpalhdlnbpafiamejdnhcphjbkeiagm;https://clients2.google.com/service/update2/crx",
    "mfidmkgnfgnkihnjeklbekckimkipmoe;https://clients2.google.com/service/update2/crx"
  ],
  "DefaultNotificationsSetting": 2
}

• http://woshub.com/how-to-configure-google-chrome-via-group-policies/
• https://developer.chrome.com/apps/external_extensions#registry

HKEY_LOCAL_MACHINE\Software\Google\Chrome\Extensions
HKEY_LOCAL_MACHINE\Software\Wow6432Node\Google\Chrome\Extensions

HKEY_CURRENT_USER\Software\Google\Chrome\Extensions
HKEY_CURRENT_USER\Software\Wow6432Node\Google\Chrome\Extensions

chrome://policy/