Examine source code of KarmineCorp

{
  "description": "Extension pour KarmineCorp",
  "version": "2.0.1",
  "manifest_version": 2,
  "name": "KarmineCorp",
  "icons": {
    "16": "assets/icons/icon16.png",
    "48": "assets/icons/icon48.png",
    "128": "assets/icons/icon128.png"
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.bundle.js"
    ]
  },
  "author": "Praaly",
  "permissions": [
    "*://*.kametotv.fr/*",
    "*://*.ytimg.com/*",
    "*://static-cdn.jtvnw.net/*",
    "notifications",
    "storage",
    "background"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f942c330-f5ea-416a-a5d7-b5900aeb135e}"
    }
  }
}