Examine source code of InstantSkip

{
  "manifest_version": 2,
  "name": "InstantSkip",
  "version": "1.8.3",
  "description": "Instantly skip intros, recaps & outros on Netflix, Prime, Disney+ & Crunchyroll. Features 300% Volume Boost, Auto Next, Custom Speed & Scene Return. High-speed detection & zero data collection. Ultimate binge-watcher tool!",
  "browser_specific_settings": {
    "gecko": {
      "id": "themeinsideamind2@web.de",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "*://*.netflix.com/*",
    "*://*.primevideo.com/*",
    "*://*.amazon.com/*",
    "*://*.amazon.de/*",
    "*://*.amazon.co.jp/*",
    "*://*.amazon.co.uk/*",
    "*://*.amazon.ca/*",
    "*://*.amazonvideo.com/*",
    "*://*.disneyplus.com/*",
    "*://*.disney.com/*",
    "*://*.crunchyroll.com/*"
  ],
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_icon": "icons/icon48.png"
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.netflix.com/*",
        "*://*.primevideo.com/*",
        "*://*.amazon.com/*",
        "*://*.amazon.de/*",
        "*://*.amazon.co.jp/*",
        "*://*.amazon.co.uk/*",
        "*://*.amazon.ca/*",
        "*://*.amazonvideo.com/*",
        "*://*.disneyplus.com/*",
        "*://*.disney.com/*",
        "*://*.crunchyroll.com/*"
      ],
      "js": [
        "utils/config.js",
        "content_scripts/main.js"
      ],
      "css": [
        "content_scripts/style.css"
      ],
      "all_frames": true,
      "run_at": "document_end"
    }
  ]
}