Examine source code of /clean for Slack

{
  "manifest_version": 3,
  "name": "/clean for Slack",
  "version": "1.0.0",
  "description": "Bulk delete Slack messages directly from your browser - no OAuth required",
  "permissions": [
    "storage",
    "scripting",
    "activeTab"
  ],
  "host_permissions": [
    "https://slack.com/*",
    "https://*.slack.com/*",
    "https://api.gumroad.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://slack.com/*",
        "https://*.slack.com/*"
      ],
      "js": [
        "src/content/utils/rate-limiter.js",
        "src/content/utils/token-extractor.js",
        "src/content/utils/api-request-handler.js",
        "src/content/utils/channel-manager.js",
        "src/content/utils/slack-api.js",
        "src/content/utils/message-filter.js",
        "src/content/utils/progress-reporter.js",
        "src/content/content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "action": {
    "default_popup": "src/popup/popup.html",
    "default_title": "/clean for Slack",
    "default_icon": {
      "16": "assets/icons/icon16.png",
      "32": "assets/icons/icon32.png",
      "48": "assets/icons/icon48.png",
      "128": "assets/icons/icon128.png"
    }
  },
  "icons": {
    "16": "assets/icons/icon16.png",
    "32": "assets/icons/icon32.png",
    "48": "assets/icons/icon48.png",
    "128": "assets/icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d25051b8-5a51-4671-a008-b357b63aae3d}",
      "strict_min_version": "109.0"
    }
  },
  "background": {
    "scripts": [
      "src/background/background.js"
    ]
  }
}