Examine source code of Twitch No Sub

{
  "name": "TwitchNoSub",
  "version": "0.7",
  "description": "Show sub only VOD on Twitch",
  "manifest_version": 2,
  "icons": {
    "128": "assets/icons/icon.png"
  },
  "web_accessible_resources": [
    "src/amazon-ivs-worker.min.js"
  ],
  "background": {
    "scripts": [
      "src/background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "activeTab",
    "tabs",
    "webNavigation",
    "webRequest",
    "webRequestBlocking",
    "https://*.twitch.tv/*",
    "https://static.twitchcdn.net/assets/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{db7af3a9-f145-48d9-86b5-45c807773c75}",
      "strict_min_version": "48.0"
    }
  }
}