Examine source code of Security Header Grader

{
  "manifest_version": 2,
  "name": "Security Header Grader",
  "version": "1.0.1",
  "description": "Analyze HTTP security headers on any page — grade, explain misconfigurations, detect tech stack leaks, and get exact fixes. Built for pentesters and developers.",
  "author": "Abinesh Kamal K U",
  "permissions": [
    "activeTab",
    "webRequest",
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "src/background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "src/popup.html",
    "default_title": "Security Header Grader",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "64": "icons/icon64.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "security-header-grader@addon",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "web_accessible_resources": [
    "src/*"
  ]
}