Examine source code of SimpleToDoSync

{
  "manifest_version": 2,
  "name": "SimpleToDoSync",
  "permissions": [
    "storage"
  ],
  "version": "1.1.0",
  "description": "Simple ToDo extension for Firefox",
  "icons": {
    "48": "icons/icon32.png"
  },
  "browser_action": {
    "default_popup": "todo.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "SimpleToDoSync@SunilGoothy",
      "strict_min_version": "60.0"
    }
  }
}