Examine source code of Duplicate Bypass for FFZ

{
  "manifest_version": 3,
  "name": "Duplicate Bypass for FFZ",
  "version": "1.0.1",
  "description": "External add-on for FrankerFaceZ that lets you bypass Twitch their duplicate message check.",
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    },
    "default_popup": "views/popup.html",
    "default_title": "Duplicate Bypass for FFZ"
  },
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.twitch.tv/*"
      ],
      "js": [
        "content-scripts/content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "scripts/duplicate-bypass.js",
        "scripts/ffz-detector.js"
      ],
      "matches": [
        "https://*.twitch.tv/*"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://*.twitch.tv/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "duplicate-bypass@petal.sh"
    }
  }
}