Examine source code of ModHeader By GreatJIN

{
  "manifest_version": 3,
  "name": "ModHeader By GreatJIN",
  "description": "Header modifier using blocking webRequest.",
  "version": "0.1.18",
  "icons": {
    "32": "assets/icons/icon_32x32.png",
    "64": "assets/icons/icon_64x64.png",
    "128": "assets/icons/icon_128x128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "gj-modheader-firefox@example.local",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "action": {
    "default_title": "ModHeader By GreatJIN",
    "default_icon": {
      "32": "assets/icons/icon_32x32.png",
      "64": "assets/icons/icon_64x64.png",
      "128": "assets/icons/icon_128x128.png"
    },
    "default_popup": "src/popup/popup.html"
  },
  "background": {
    "scripts": [
      "src/background/service-worker.js"
    ],
    "type": "module"
  },
  "options_ui": {
    "page": "src/options/options.html",
    "open_in_tab": true
  },
  "permissions": [
    "alarms",
    "storage",
    "webRequest",
    "webRequestBlocking"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/content/content-script.js"
      ],
      "run_at": "document_start"
    }
  ],
  "author": "GreatJIN"
}