Examine source code of YouTube Element Remover

{
  "manifest_version": 2,
  "name": "YouTube Element Remover",
  "version": "1.0",
  "description": "Removes specific elements (e.g., Shorts) from YouTube homepage.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "activeTab",
    "https://www.youtube.com/"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "contentScript.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{63cb8981-e635-4f46-a606-867d88ee307e}"
    }
  }
}