Examine source code of Browser Task Manager

{
  "manifest_version": 2,
  "name": "Browser Task Manager",
  "version": "1.0",
  "description": "Manage your tasks and to-do lists",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "permissions": [
    "storage",
    "notifications",
    "alarms"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "tasm@abatroski.net",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}