Examine source code of Masque IP Speedtest

{
  "manifest_version": 2,
  "name": "Masque IP Speedtest",
  "version": "1.0",
  "description": "Masque l'IP affichée sur Speedtest",
  "permissions": [
    "activeTab"
  ],
  "icons": {
    "128": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Masque IP Speedtest"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.speedtest.net/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "masque-ip-speedtest@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}