Examine source code of note2md exporter

{
  "manifest_version": 2,
  "name": "note2md exporter",
  "description": "note.comからmarkdownファイルでエクスポートする拡張機能",
  "version": "1.0",
  "applications": {
    "gecko": {
      "strict_min_version": "60.0"
    }
  },
  "content_scripts": [
    {
      "all_frames": true,
      "matches": [
        "https://note.com/settings/account"
      ],
      "js": [
        "src/lib/jszip.js",
        "src/lib/FileSaver.js",
        "src/pagescript.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "permissions": [
    "https://note.com/settings/account"
  ],
  "icons": {
    "48": "icons/icon_48.png",
    "96": "icons/icon_96.png"
  },
  "browser_action": {
    "default_icon": "icons/icon_48.png",
    "default_title": "note2md"
  }
}