A method and system for managing website blacklists to control website access of a user. In one embodiment, a client queries a database regarding a location of a website before the client fetches a resource from the website. The database includes a list of websites based on which access by the client is controlled. If the location of the website in the query exists in the database, the client displays a warning dialog and receives a user input. The client determines whether to continue fetching the resource based on the user input to the warning dialog.