Examine source code of Moonly - js and css injector

{
  "manifest_version": 3,
  "name": "Moonly - javascript and css injector",
  "version": "1.3",
  "description": "Inject javascript and css into pages dynamically.",
  "permissions": [
    "tabs",
    "scripting",
    "storage",
    "activeTab"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "type": "module",
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "Moonly - javascript and css injector",
    "default_icon": {
      "16": "icons/moon16.png",
      "32": "icons/moon32.png",
      "64": "icons/moon64.png",
      "128": "icons/moon128.png",
      "256": "icons/moon256.png",
      "512": "icons/moon512.png"
    }
  },
  "icons": {
    "16": "icons/moon16.png",
    "32": "icons/moon32.png",
    "64": "icons/moon64.png",
    "128": "icons/moon128.png",
    "256": "icons/moon256.png",
    "512": "icons/moon512.png"
  },
  "options_page": "script_manager.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "{3fc64058-8d8b-439f-b840-9ea87df76899}",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}