Examine source code of ScrollRot - Delays on short-form feeds

{
  "manifest_version": 3,
  "name": "ScrollRot - Delays on short-form feeds",
  "version": "1.1.0",
  "description": "Add delays between YouTube Shorts, Instagram Reels & TikTok. Includes Pomodoro timer to block distracting content.",
  "action": {
    "default_popup": "src/popupPage/index.html"
  },
  "options_page": "src/optionsPage/index.html",
  "icons": {
    "16": "assets/icon_16.png",
    "32": "assets/icon_32.png",
    "48": "assets/icon_48.png",
    "128": "assets/icon_128.png"
  },
  "permissions": [
    "storage",
    "alarms"
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "assets/pause.svg",
        "assets/video-counter.svg"
      ],
      "matches": [
        "https://www.instagram.com/*",
        "https://www.youtube.com/*",
        "https://www.tiktok.com/*",
        "https://www.facebook.com/*",
        "https://www.snapchat.com/*"
      ]
    }
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "content-scripts/youtube.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://www.instagram.com/*"
      ],
      "js": [
        "content-scripts/instagram.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://www.tiktok.com/*"
      ],
      "js": [
        "content-scripts/tiktok.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://www.facebook.com/*"
      ],
      "js": [
        "content-scripts/facebook.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://www.snapchat.com/*"
      ],
      "js": [
        "content-scripts/snapchat.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "scrollrot@scrollrot.net",
      "strict_min_version": "126.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "service-workers/badge.js"
    ]
  }
}