Examine source code of itzy-highlighter

{
  "manifest_version": 3,
  "name": "itzy",
  "version": "1.0.0",
  "description": "highlight and note the sentences that matter in chatgpt and claude.",
  "browser_specific_settings": {
    "gecko": {
      "id": "itzy-highlighter@nishant.local",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "https://chatgpt.com/*",
    "https://chat.openai.com/*",
    "https://claude.ai/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "itzy",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/itzy-icon-dark-tile.svg",
      "48": "icons/itzy-icon-dark-tile.svg",
      "128": "icons/itzy-icon-dark-tile.svg"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://chatgpt.com/*",
        "https://chat.openai.com/*",
        "https://claude.ai/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "library.html",
        "icons/*.svg"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "icons": {
    "16": "icons/itzy-icon-dark-tile.svg",
    "48": "icons/itzy-icon-dark-tile.svg",
    "128": "icons/itzy-icon-dark-tile.svg"
  }
}