Examine source code of Peekscore - IMDb Ratings for Netflix & Prime

{
  "manifest_version": 3,
  "name": "Peekscore - IMDb Ratings for Netflix & Prime",
  "version": "2.2.0",
  "description": "IMDb, Rotten Tomatoes & Metacritic scores on every Netflix poster. Dim what isn't worth it. No sign-up, no setup, no tracking.",
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "permissions": [
    "storage",
    "alarms",
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "https://www.omdbapi.com/*",
    "https://v3.sg.media-imdb.com/*",
    "https://api.agregarr.org/*",
    "https://api.themoviedb.org/*",
    "https://xmdbapi.com/*"
  ],
  "optional_host_permissions": [
    "https://*.cineworld.co.uk/*",
    "https://*.odeon.co.uk/*",
    "https://*.myvue.com/*",
    "https://*.amazon.com/*",
    "https://*.amazon.co.uk/*",
    "https://*.amazon.de/*",
    "https://*.amazon.fr/*",
    "https://*.amazon.es/*",
    "https://*.amazon.it/*",
    "https://*.amazon.ca/*",
    "https://*.amazon.com.au/*",
    "https://*.amazon.in/*",
    "https://*.amazon.co.jp/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.netflix.com/*",
        "https://*.primevideo.com/*"
      ],
      "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-styling.js",
        "content/badge-renderer.js",
        "content/scanner-base.js",
        "content/url-observer.js",
        "content/scan-registry.js",
        "content/selector-health.js",
        "content/scanners/netflix-helpers.js",
        "content/scanners/netflix.js",
        "content/scanners/netflix-billboard.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": [
          "websiteContent"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}