Examine source code of Line Shuffler Addon

{
  "manifest_version": 2,
  "name": "Line Shuffler Addon",
  "version": "1.0.1",
  "description": "Shuffle the order of text lines randomly.",
  "browser_action": {
    "default_title": "Shuffle Lines",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "shuffle-lines-b4497e73-d8fa-4b1a-bcfd-8330f2a8cc7a@example.com",
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}