Examine source code of Number List Transformer

{
  "manifest_version": 2,
  "name": "Number List Transformer",
  "version": "1.3.0",
  "description": "Clean, deduplicate, sort and reformat messy number lists.",
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Number List Transformer",
    "default_icon": {
      "48": "icons/icon48.png",
      "96": "icons/icon96.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "clipboardWrite",
    "clipboardRead",
    "downloads",
    "storage",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{ff374e9b-b738-477c-bdab-863777941e26}"
    }
  }
}