Examine source code of Favlink

{
  "manifest_version": 2,
  "name": "Favlink",
  "description": "Organisez vos outils web et accédez-y en un clic",
  "version": "1.0.4",
  "browser_specific_settings": {
    "gecko": {
      "id": "contact@favlink.io",
      "strict_min_version": "48.0"
    }
  },
  "icons": {
    "48": "48.png",
    "128": "128.png",
    "256": "256.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "all_frames": true,
      "js": [
        "js/extension.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "content_security_policy": "script-src 'self' https://team.favlink.io; object-src 'self'",
  "permissions": [
    "activeTab",
    "storage",
    "https://team.favlink.io/*"
  ]
}