How do I put a number on my Google Chrome extension?

Question

So I'm developing a chrome extension and I would like to put a number on the icon. I'm assuming this is done through the canvas element but I can't find any examples. Anyone have an example they want to share?

Answer 1

The number is called a "badge", and you can use up to four characters: http://code.google.com/chrome/extensions/browserAction.html

Call setBadgeText() to change it.