This is what you're looking for. Blocks everything except whitelisted sites: https://chrome.google.com/webstore/detail/whitelist-manager/pocjkchlmhkjafdpmkklkn

This is what you're looking for. Blocks everything except whitelisted sites: https://chrome.google.com/webstore/detail/whitelist-manager/pocjkchlmhkjafdpmkklknmjhokobgmh?hl=en https://chrome.google.com/webstore/detail/whitelist-manager/...