Examine source code of FA Notes Saver

{
  "name": "FA Notes Saver",
  "version": "1.0.0",
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "*://*.furaffinity.net/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "manifest_version": 2
}