Examine source code of Prompt Guard

{
  "manifest_version": 3,
  "name": "Prompt Guard",
  "short_name": "Prompt Guard",
  "version": "0.1.0",
  "description": "Alerts when sensitive data is typed into AI prompt fields.",
  "icons": {
    "128": "assets/icon128.png"
  },
  "action": {
    "default_title": "Prompt Guard",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "128": "assets/icon128.png"
    }
  },
  "options_page": "options/options.html",
  "permissions": [
    "storage",
    "scripting",
    "activeTab",
    "tabs"
  ],
  "host_permissions": [
    "https://chatgpt.com/*",
    "https://*.chatgpt.com/*",
    "https://chat.openai.com/*",
    "https://claude.ai/*",
    "https://*.claude.ai/*",
    "https://gemini.google.com/*",
    "https://copilot.microsoft.com/*",
    "https://perplexity.ai/*",
    "https://www.perplexity.ai/*",
    "https://poe.com/*",
    "https://*.poe.com/*"
  ],
  "optional_host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "prompt-guard@example.local",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "shared/browser-api.js",
      "shared/default-rules.js",
      "shared/detector.js",
      "shared/settings.js",
      "background/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://chatgpt.com/*",
        "https://*.chatgpt.com/*",
        "https://chat.openai.com/*",
        "https://claude.ai/*",
        "https://*.claude.ai/*",
        "https://gemini.google.com/*",
        "https://copilot.microsoft.com/*",
        "https://perplexity.ai/*",
        "https://www.perplexity.ai/*",
        "https://poe.com/*",
        "https://*.poe.com/*"
      ],
      "js": [
        "shared/browser-api.js",
        "shared/default-rules.js",
        "shared/detector.js",
        "shared/settings.js",
        "content/content.js"
      ],
      "css": [
        "content/content.css"
      ],
      "run_at": "document_idle"
    }
  ]
}