The extension provides easy way to tip your favorite web site that uses YggDore service.YggDore is a service sending tip to your favorite site if you know its URL.
When you opens favorite site on the browser and clicks "Add a tip to cart for the site" button on this extension's popup, this extension inputs URL of the favorite site to web form of the service instead of you.
Now, this extension supports japanese only.
Reviews of YggDore Toolbar for Google Chrome extension