Good idea but this extension needs stronger security. My 11 year old son simply disabled the extension to get to the blocked website (Youtube). Aside from requiring a password to remove a website, the password should also be needed to allow (or disallow) a user from simply disabling the extension. Looking forward to a fixed extension with stronger security features.

Nice and useful. It would be better if you could add an option to automatically close the blocked site (the tab, I mean) instead of showing an option to type in a password. Sometimes we just want to entirely skip those sites.