Examine source code of xHeader - Modify HTTP headers

{
  "manifest_version": 3,
  "name": "xHeader - Modify HTTP headers",
  "short_name": "xHeader",
  "version": "1.0.1",
  "description": "A modern ModHeader alternative for modifying request headers and response headers with profiles, filters, tab targeting, and sync.",
  "icons": {
    "16": "assets/logo_16.png",
    "32": "assets/logo_32.png",
    "48": "assets/logo_48.png",
    "128": "assets/logo_128.png"
  },
  "permissions": [
    "storage",
    "tabGroups",
    "declarativeNetRequestWithHostAccess"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "assets/service_worker.ts-gWxginHn.js"
    ],
    "type": "module"
  },
  "action": {
    "default_title": "Open xHeader",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "assets/logo_16.png",
      "32": "assets/logo_32.png",
      "48": "assets/logo_48.png",
      "128": "assets/logo_128.png"
    }
  },
  "options_ui": {
    "page": "index.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "xheader@joinapppass.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "browsingActivity",
          "websiteContent"
        ]
      }
    }
  }
}