Examine source code of Twitch Custom Badges

{
  "manifest_version": 2,
  "name": "TwitchBadges",
  "version": "1.1.1",
  "description": "Badges pour le chat de Twitch | Custom badges for Twitch chat",
  "icons": {
    "48": "icons/badges-48.png"
  },
  "content_scripts": [
    {
      "js": [
        "bundle.js"
      ],
      "matches": [
        "*://*.twitch.tv/*",
        "*://*.twitch.tv/xurei",
        "*://*.twitch.tv/xurei?*",
        "*://*.twitch.tv/popout/xurei/chat*",
        "*://dashboard.twitch.tv/u/xurei/stream-manager",
        "*://dashboard.twitch.tv/u/xurei/stream-manager?*",
        "*://*.twitch.tv/moderator/xurei",
        "*://*.twitch.tv/moderator/xurei?*",
        "*://*.twitch.tv/*",
        "*://*.twitch.tv/hiuuugs",
        "*://*.twitch.tv/hiuuugs?*",
        "*://*.twitch.tv/popout/hiuuugs/chat*",
        "*://dashboard.twitch.tv/u/hiuuugs/stream-manager",
        "*://dashboard.twitch.tv/u/hiuuugs/stream-manager?*",
        "*://*.twitch.tv/moderator/hiuuugs",
        "*://*.twitch.tv/moderator/hiuuugs?*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "twitch_badges@xureilab.com"
    }
  },
  "permissions": [
    "https://twitch-badges-ext.vercel.app/*"
  ]
}