Examine source code of Grid Genie

{
  "manifest_version": 3,
  "name": "Grid Genie",
  "version": "2.0",
  "description": "Upload a CSV to any table or download any table on the page as a CSV file.",
  "permissions": [
    "activeTab"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/icon16.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    }
  },
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/content.js"
      ],
      "css": [
        "css/add.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "extensionsupport@broccolihero.mozmail.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}