Examine source code of FF Headers

{
  "manifest_version": 3,
  "name": "FF Headers",
  "version": "1.3.0",
  "description": "Czysty edytor nagłówków HTTP: dodawaj, zmieniaj i usuwaj headery żądań.",
  "browser_specific_settings": {
    "gecko": {
      "id": "ffheaders@local",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "action": {
    "default_title": "FF Headers",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon.svg",
      "32": "icons/icon.svg",
      "48": "icons/icon.svg"
    }
  },
  "background": {
    "scripts": [
      "headers-engine.js",
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking"
  ],
  "host_permissions": [
    "<all_urls>"
  ]
}