Examine source code of Crossword Scraper

{
  "manifest_version": 2,
  "name": "Crossword Scraper",
  "description": "Download digital puzzle files from crossword applets for offline solving.",
  "version": "1.3.35",
  "icons": {
    "128": "128.png"
  },
  "browser_action": {
    "default_icon": "48.png",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "permissions": [
    "activeTab",
    "cookies",
    "storage",
    "webNavigation"
  ],
  "optional_permissions": [
    "http://*/",
    "https://*/"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d48182db-7419-4305-8f09-e886fbd4d74d}"
    },
    "gecko_android": {
      "id": "{d48182db-7419-4305-8f09-e886fbd4d74d}",
      "strict_min_version": "130.0"
    }
  }
}