Examine source code of Download Vine Video

{
  "manifest_version": 2,
  "name": "Download Vine Video",
  "version": "1.0.3resigned1",
  "description": "Click to download any Vine.co video.",
  "browser_action": {
    "default_icon": "icon.png"
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{06f62c90-30a9-49a9-bba6-d1e6a093efd7}"
    }
  }
}