Examine source code of ValaSTREAM

{
  "manifest_version": 2,
  "name": "ValaSTREAM",
  "description": "Cette extension vous informe si Valanor est en stream ! Crée par Shizu (https://twitter.com/Skette0)",
  "version": "1.6",
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "ValaStream - Hors-Ligne"
  },
  "icons": {
    "64": "assets/images/icon_64.png"
  },
  "web_accessible_resources": [
    "assets/images/icon_64.png",
    "assets/images/isonline.png",
    "assets/images/isoffline.png"
  ],
  "author": "Shizu",
  "background": {
    "persistent": true,
    "scripts": [
      "assets/js/background.js"
    ]
  },
  "permissions": [
    "notifications",
    "background",
    "https://api.twitch.tv/kraken/streams?channel=*",
    "*://valastream.fr/api.php*",
    "*://*.youtube.com/*",
    "*://*.ytimg.com/*",
    "*://yt3.ggpht.com/*",
    "*://*.googleapis.com/*"
  ]
}