Examine source code of ShortBlocker

{
  "manifest_version": 2,
  "name": "ShortBlocker",
  "version": "1.0.0",
  "description": "Instantly closes YouTube Shorts and Instagram Reels tabs so you stay focused.",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "https://www.youtube.com/*",
    "https://youtube.com/*",
    "https://www.instagram.com/*",
    "https://instagram.com/*"
  ],
  "background": {
    "scripts": [
      "src/background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "src/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*",
        "https://youtube.com/*",
        "https://www.instagram.com/*",
        "https://instagram.com/*"
      ],
      "js": [
        "src/content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "shortblocker@extension",
      "strict_min_version": "91.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}