Examine source code of Vision13 GA

{
  "manifest_version": 2,
  "version": "2",
  "name": "Vision13 GA",
  "description": "Extension pour faciliter la lecture sur vision13.net",
  "icons": {
    "16": "images/logo_16.png",
    "48": "images/logo_48.png",
    "128": "images/logo_128.png"
  },
  "browser_action": {
    "default_icon": "images/logo.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "https://uptobox.com/*",
    "https://vision13.net/*",
    "https://uptobox.com/getjson*",
    "https://vision13.net/getjson*",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://uptobox.com/*",
        "https://vision13.net/*"
      ],
      "js": [
        "app.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "app.js"
    ],
    "persistent": false
  }
}