Examine source code of MCSR PB Display

{
  "manifest_version": 3,
  "name": "MCSR PB Display",
  "version": "0.3.0",
  "description": "Browser extension to have your Minecraft Speedrun PB displayed next to your name on Twitch",
  "action": {
    "default_title": "MCSR PB Display",
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://*.twitch.tv/*",
    "http://localhost:3000/*",
    "https://mcsr-pb-display.menyh.art/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@mcsr-pb-display",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "websiteContent"
        ]
      }
    }
  },
  "icons": {
    "128": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.twitch.tv/*"
      ],
      "js": [
        "mcsrPbDisplay.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ]
}