Examine source code of Dopamine Detox

{
  "manifest_version": 3,
  "name": "Dopamine Detox",
  "description": "Block TikTok, YouTube Shorts, and Instagram Reels",
  "version": "0.1.3",
  "icons": {
    "32": "icon-32.png",
    "64": "icon-64.png",
    "128": "icon-128.png"
  },
  "permissions": [
    "declarativeNetRequest",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "dopamine-detox@aguiarcode",
      "data_collection_permissions": {
        "private_browsing": "neither",
        "data_collection": "neither",
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.instagram.com/*"
      ],
      "run_at": "document_start",
      "js": [
        "content-scripts/instagram-reels.js"
      ]
    },
    {
      "matches": [
        "*://*.tiktok.com/*"
      ],
      "run_at": "document_start",
      "js": [
        "content-scripts/tiktok.js"
      ]
    },
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "run_at": "document_start",
      "js": [
        "content-scripts/youtube-shorts.js"
      ]
    }
  ]
}