If you are a web developer using Local Storage capabilities of modern web browsers, you might want to check this Chrome Web App.

LocalStorage DevTool lets you manage the localStorage objects from other sites in your Chrome installation.

The developers spoke about this app:

Local Storage Development tool give you the options you need to manage the localStorage object, which is an HTML5 entity to store your application data in the client side. You can create, remove, edit (value & key!), and clear your local storage.