Examine source code of Open Headers

{
  "name": "Open Headers",
  "description": "Record your browser tab. Modify HTTP Traffic. Team Workspaces. Everything local.",
  "author": "Open Headers",
  "version": "4.1.4",
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "contact@tirzuman.com",
      "strict_min_version": "109.0"
    }
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/icon16.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    }
  },
  "permissions": [
    "storage",
    "alarms",
    "declarativeNetRequest",
    "declarativeNetRequestWithHostAccess",
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "webNavigation",
    "activeTab",
    "scripting",
    "downloads",
    "cookies"
  ],
  "host_permissions": [
    "<all_urls>",
    "file:///*"
  ],
  "background": {
    "scripts": [
      "js/background/index.js"
    ],
    "type": "module"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "*.html",
        "*.js",
        "*.css",
        "js/*.js",
        "js/**/*.js",
        "images/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+Period",
        "mac": "Command+Shift+Period"
      },
      "description": "Open Open Headers popup"
    }
  },
  "content_security_policy": {
    "extension_pages": "default-src 'self'; connect-src 'self' ws://127.0.0.1:59210 http://127.0.0.1:59210; style-src 'self' 'unsafe-inline' https://cdnjs.cloudflare.com; script-src 'self'; font-src 'self' https://cdnjs.cloudflare.com"
  }
}