Examine source code of Simple Mind Map

{
  "manifest_version": 2,
  "name": "Simple Mind Map",
  "version": "1.0.0",
  "description": "Open an editable minimal mind map from the toolbar icon or context menu.",
  "permissions": [
    "contextMenus",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Open Mind Map",
    "default_icon": "128.png"
  },
  "icons": {
    "16": "128.png",
    "48": "128.png",
    "128": "128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "simple-mind-map@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}