Examine source code of Twitching

{
  "manifest_version": 3,
  "name": "__MSG_extName__",
  "version": "0.4.0",
  "default_locale": "en",
  "description": "__MSG_extDescription__",
  "browser_specific_settings": {
    "gecko": {
      "id": "twitching@ganakas.github.io",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_title": "__MSG_actionTitle__",
    "default_popup": "src/popup/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png"
    }
  },
  "background": {
    "scripts": [
      "src/background/fetch-proxy.js",
      "src/background/background.js"
    ]
  },
  "permissions": [
    "storage",
    "scripting",
    "webNavigation"
  ],
  "host_permissions": [
    "https://www.twitch.tv/*",
    "https://*.twitch.tv/*",
    "https://gql.twitch.tv/*",
    "https://usher.ttvnw.net/*",
    "https://*.ttvnw.net/*",
    "https://*.cloudfront.net/*",
    "https://*.twitchcdn.net/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.twitch.tv/*",
        "https://*.twitch.tv/*"
      ],
      "js": [
        "vendor/hls.min.js",
        "src/shared/defaults.js",
        "src/shared/i18n.js",
        "src/shared/dom.js",
        "src/shared/ext-fetch.js",
        "src/shared/hls-bg-loader.js",
        "src/shared/page-hls-client.js",
        "src/content/vod.js",
        "src/content/twitch-icons.js",
        "src/content/vod-settings.js",
        "src/content/vod-player.js",
        "src/content/rewind.js",
        "src/content/seekbar.js",
        "src/content/seek-preview.js",
        "src/content/click-to-pause.js",
        "src/content/main.js"
      ],
      "css": [
        "src/content/overlay.css"
      ],
      "run_at": "document_idle"
    }
  ]
}