Examine source code of ScrollCount

{
  "manifest_version": 3,
  "name": "ScrollCount",
  "version": "1.0.0",
  "description": "ScrollCount helps you count the number of reels and shorts you scroll on Instagram and YouTube.",
  "permissions": [
    "storage",
    "tabs",
    "activeTab"
  ],
  "host_permissions": [
    "https://www.instagram.com/*",
    "https://www.youtube.com/*",
    "https://m.youtube.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.instagram.com/*",
        "https://www.youtube.com/*",
        "https://m.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "scrollcount@example.com",
      "strict_min_version": "109.0"
    }
  }
}