Examine source code of Screenshot extension

{
  "name": "Screenshot extension",
  "version": "1.0",
  "description": "Building a screenshot taking extension",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "camera.png",
    "default_title": "Take a screen shot!"
  },
  "icons": {
    "16": "images/camera16.png",
    "32": "images/camera32.png",
    "64": "images/camera64.png",
    "128": "images/camera128.png"
  },
  "permissions": [
    "activeTab"
  ],
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{a2583644-0e74-42e8-a89b-76b58f1e11d9}"
    }
  }
}