Examine source code of Keyquill

{
  "manifest_version": 3,
  "name": "Keyquill",
  "version": "1.1.0",
  "description": "Securely store LLM API keys in your browser. Use your own keys from any web app without trusting their server.",
  "author": "R-Okauchi",
  "homepage_url": "https://github.com/R-Okauchi/keyquill",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "externally_connectable": {
    "matches": []
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "action": {
    "default_popup": "src/popup/index.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "keyquill@app.keyquill.dev",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "personalCommunications"
        ]
      }
    }
  }
}