I am using an extension in Chrome that blocks certain websites. It works fine and the settings are password protected, but no password is required to uninstall the extension. This obviates its function because it can be removed, unblocking the sites with two clicks.

I have not been able to find a website blocking extension that requires a password to uninstall so I assume that this is not possible. People use these website blockers so there must be some other way to prevent them from being uninstalled. How can I do this with Chrome?