Examine source code of Folder Save Manager

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "2.0.0",
  "icons": {
    "16": "assets/icon_16.png",
    "128": "assets/icon_128.png"
  },
  "browser_action": {
    "default_icon": {
      "19": "assets/icon_16.png",
      "38": "assets/icon_128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{68e919c5-f1d0-3dbe-b5d0-2050f0b2852c}",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "collects_data": false
      },
      "strict_min_version": "112.0"
    }
  },
  "permissions": [
    "tabs",
    "activeTab",
    "contextMenus"
  ],
  "content_security_policy": "script-src 'self'; style-src 'self' 'unsafe-inline'; font-src 'self' data:; object-src 'self';",
  "background": {
    "scripts": [
      "data/pdfkit/pdfkit.js",
      "background.js"
    ]
  }
}