Nyan

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Nyan",
  "version": "0.1",
  "manifest_version": 2,
  "description": "Plays Nyan Cat in the background. The perfect way to annoy your friends.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "nyan-icon.png"
  }
}