chrome/common/extensions/docs/examples/api/tabs/screenshot/manifest.json

{
  "name": "Test Screenshot Extension",
  "version": "1.1",
  "description": "Demonstrate screenshot functionality in the chrome.tabs api. Note: only works for code.google.com",
  "background": {
    "persistent": false,
    "scripts": ["background.js"]
  },
  "browser_action": {
    "default_icon": "camera.png",
    "default_title": "Take a screen shot!"
  },
  "permissions": [
    "tabs", "*://code.google.com/"
  ],
  "manifest_version": 2
}