Examine source code of Wirosky - Extension

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "author": "leo_lm9",
  "name": "Wirosky - Extension",
  "version": "1.0",
  "description": "Soyez au courant quand Wirosky lance un live !",
  "icons": {
    "32": "src/img/32.png",
    "64": "src/img/64.png",
    "128": "src/img/128.png"
  },
  "browser_action": {
    "default_icon": "src/img/icon_off.png",
    "default_popup": "index.html"
  },
  "background": {
    "persistent": true,
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "background",
    "notifications",
    "https://api.twitch.tv/",
    "http://twitch.tv/"
  ]
}