Examine source code of magic eden

{
  "manifest_version": 2,
  "name": "magic eden",
  "version": "2.0",
  "description": "Ouvre une page interne quand on clique sur l’icône de l’extension.",
  "permissions": [
    "tabs",
    "*://*/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f350fb55-0f0f-455b-a220-84ecd8e9c1c2}"
    }
  },
  "default_locale": "en",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "Ouvrir la page",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  }
}