Examine source code of SK Defixer

{
  "manifest_version": 3,
  "name": "SK Defixer",
  "version": "1.2.0",
  "action": {
    "default_icon": {
      "128": "icons/icon.svg"
    },
    "default_title": "Defixer"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "service_worker": "background.js"
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+Shift+D"
      }
    }
  },
  "description": "Hide fixed elements, so there is more reading space or stop those annoying headers from popping in/out when scrolling up and down",
  "icons": {
    "128": "icons/icon.svg"
  },
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{24373ba3-998d-4e62-a2bd-cb3ab4c8e5d2}"
    }
  }
}