Examine source code of Keystone Privacy Shield

{
  "manifest_version": 3,
  "name": "Keystone Privacy Shield",
  "version": "0.1.1",
  "description": "Zero-knowledge privacy for AI chats. Redacts PII before it reaches ChatGPT, Claude, or any LLM.",
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "contextMenus"
  ],
  "host_permissions": [
    "http://localhost:8000/*",
    "http://127.0.0.1:8000/*"
  ],
  "background": {
    "scripts": [
      "service-worker-loader.js"
    ],
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "keystone@keystoneprivacy.com",
      "strict_min_version": "126.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "js": [
        "assets/index.ts-B3cPd049.js"
      ],
      "matches": [
        "https://chatgpt.com/*",
        "https://chat.openai.com/*",
        "https://claude.ai/*",
        "https://gemini.google.com/*",
        "https://www.perplexity.ai/*"
      ],
      "run_at": "document_idle"
    }
  ],
  "action": {
    "default_popup": "src/popup/index.html",
    "default_icon": {
      "16": "assets/icons/icon-16.png",
      "48": "assets/icons/icon-48.png",
      "128": "assets/icons/icon-128.png"
    }
  },
  "options_page": "src/options/index.html",
  "icons": {
    "16": "assets/icons/icon-16.png",
    "48": "assets/icons/icon-48.png",
    "128": "assets/icons/icon-128.png"
  },
  "web_accessible_resources": [
    {
      "matches": [
        "<all_urls>"
      ],
      "resources": [
        "assets/icons/*.png"
      ]
    },
    {
      "matches": [
        "https://chat.openai.com/*",
        "https://chatgpt.com/*",
        "https://claude.ai/*",
        "https://gemini.google.com/*",
        "https://www.perplexity.ai/*"
      ],
      "resources": [
        "assets/index.ts-B3cPd049.js"
      ]
    }
  ]
}