Examine source code of Peekscore

{
  "manifest_version": 3,
  "name": "Peekscore",
  "version": "1.7.0",
  "description": "Displays IMDb, Rotten Tomatoes and Metacritic ratings on cinema listings, Netflix, and Prime Video.",
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "permissions": [
    "storage",
    "alarms"
  ],
  "host_permissions": [
    "https://www.netflix.com/*",
    "https://www.primevideo.com/*",
    "https://www.amazon.com/*",
    "https://www.amazon.co.uk/*",
    "https://www.cineworld.co.uk/*",
    "https://www.odeon.co.uk/*",
    "https://www.myvue.com/*",
    "https://www.omdbapi.com/*",
    "https://api.imdbapi.dev/*"
  ],
  "optional_host_permissions": [
    "https://www.amazon.de/*",
    "https://www.amazon.fr/*",
    "https://www.amazon.es/*",
    "https://www.amazon.it/*",
    "https://www.amazon.ca/*",
    "https://www.amazon.com.au/*",
    "https://www.amazon.in/*",
    "https://www.amazon.co.jp/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.netflix.com/*",
        "*://*.primevideo.com/*",
        "*://*.amazon.com/gp/video/*",
        "*://*.amazon.co.uk/gp/video/*",
        "*://*.cineworld.co.uk/*",
        "*://*.odeon.co.uk/*",
        "*://*.myvue.com/*",
        "*://*.amazon.de/gp/video/*",
        "*://*.amazon.fr/gp/video/*",
        "*://*.amazon.es/gp/video/*",
        "*://*.amazon.it/gp/video/*",
        "*://*.amazon.ca/gp/video/*",
        "*://*.amazon.com.au/gp/video/*",
        "*://*.amazon.in/gp/video/*",
        "*://*.amazon.co.jp/gp/video/*"
      ],
      "js": [
        "content/config.js",
        "content/perf-tracker.js",
        "content/title-parser.js",
        "content/utils.js",
        "content/colors.js",
        "content/cache-service.js",
        "content/rating-service.js",
        "content/cinema-rating.js",
        "content/badge-renderer.js",
        "content/scanner-base.js",
        "content/url-observer.js",
        "content/scanners/netflix-helpers.js",
        "content/scanners/netflix.js",
        "content/scanners/netflix-overlay.js",
        "content/scanners/prime.js",
        "content/scanners/cinema.js",
        "content/main.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "action": {
    "default_title": "Peekscore",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/icon-16.png",
      "48": "images/icon-48.png"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "peekscore@example.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}