Are you sure? is a simple extension to help you stay productive on the internet. Distracting sites can be fun, but it's too easy to just visit them without thinking. You can be in the middle of some important work and, before you know it, your fingers have betrayed you and you're looking at cat pictures again.
This extension just pops up a simple dialog box asking "Are you sure?" when you visit a distracting site. It doesn't try to stop you, just make you aware of what you're doing so you can make a fully informed decision. It will ask you at most once every 5 minutes.
The site list is configurable, so you can add whichever sites are most distracting to you. The extension uses Chrome's event filtering API, so it should use no extra memory or CPU except when you're loading one of the sites on the list.
The source is available at https://github.com/sgentle/areyousure - feel free to post issues or suggestions there.