Examine source code of TwitchSchedule

{
  "browser_specific_settings": {
    "gecko": {
      "id": "{acc5e8b7-7942-5463-979c-da84fc335c3d}",
      "strict_min_version": "42.0"
    }
  },
  "name": "TwitchSchedule",
  "version": "4.0",
  "manifest_version": 2,
  "description": "Reveal de la prog twitch",
  "icons": {
    "128": "icon128.png"
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.twitch.tv/*"
      ],
      "js": [
        "js/content.js"
      ]
    }
  ]
}