Examine source code of Small Clock

{
  "manifest_version": 2,
  "name": "small-clock",
  "version": "0.0.7resigned1",
  "description": "A simple and small text based clock which sits in your toolbar. Ideal for fullscreen browser use",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Small Clock"
  },
  "permissions": [
    "storage"
  ],
  "applications": {
    "gecko": {
      "id": "@small-clock"
    }
  }
}