Examine source code of TheRyu7z TV

{
  "manifest_version": 2,
  "name": "TheRyu7z TV",
  "description": "Extension Web de la TheRyu7z TV",
  "version": "1.2",
  "icons": {
    "16": "./images/icons/rouge16.png",
    "48": "./images/icons/rouge48.png",
    "128": "./images/icons/rouge128.png"
  },
  "permissions": [
    "storage",
    "alarms",
    "https://api.twitch.tv/*",
    "notifications"
  ],
  "background": {
    "scripts": [
      "back.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": "rouge.png",
    "default_title": "TheRyu7z TV",
    "default_popup": "content.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://api.twitch.tv/*",
        "https://twitch-api-key.herokuapp.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}