Examine source code of XLSX Editor

{
  "manifest_version" : 3 ,
  "name" : "XLSX Editor",
  "version" : "0.1.0",
  "description" : "Open and edit Excel workbooks locally. Download your edited workbook without uploading file data.",
  "action" : {
    "default_title" : "Open XLSX Editor"
  },
  "background" : {
    "scripts" : [
      "background.js" 
    ],
    "type" : "module" 
  },
  "icons" : {
    "16" : "icons/16.png",
    "32" : "icons/32.png",
    "48" : "icons/48.png",
    "128" : "icons/128.png"
  },
  "content_security_policy" : {
    "extension_pages": "script-src 'self' 'wasm-unsafe-eval'; object-src 'none'; connect-src 'self'; worker-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b3b48ced-4518-454e-b884-992940df4cdc}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}