Examine source code of OWASP Secure Headers

{
  "manifest_version": 2,
  "name": "OWASP Secure Headers",
  "version": "1.0.0",
  "description": "Audit current page against OWASP Secure Headers guidelines. Reads response headers and meta fallbacks. Educational, read-only.",
  "permissions": [
    "activeTab",
    "tabs",
    "contextMenus",
    "storage",
    "<all_urls>",
    "webRequest"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_title": "OWASP Secure Headers",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "owasp-secure-headers@example.com",
      "strict_min_version": "102.0"
    }
  }
}