Don't you have anything better to do? Chrome 插件, crx 扩展下载

扩展ID: hkaenpmlhpjkgfnfnbfjmkmjpjpmehpa

A simple site blocker.Instead of presenting you with complicated settings, this extension lets you block the current website directly from toolbar. You can unblock the site by choosing its name from the list, and that's it. If you try loading a site while it's blocked, you'll get a friendly reminder that there are probably better things to do.