The management of Google Chromebooks uses a set of URL's that block traffic to three sets of resources.
- Internal Chrome Dialogs
- External Search Engines
- Local Development extensions
- Google Sign-in sites.
The content is always updating as new resources emerge but the list below is commonly used for education.
search.yahoo.com www.bing.com/search duckduckgo.com dogpile.com/search ixquick.com
The restriction to external search engines is not to protect Google business model but to ensure that 'safe search' is not easily bypassed.