Examine source code of Cross-Browser Sender 2

{
  "manifest_version": 2,
  "name": "Cross-Browser Sender 2",
  "version": "1.0",
  "description": "Send webpage data to Python server",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Send page data",
    "default_icon": "image.png"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "cross-browser-sender@proton.me",
      "data_collection_permissions": {
        "collects_browsing_data": false,
        "required": [
          "none"
        ]
      }
    }
  }
}