Examine source code of Disable Textarea Resize

{
  "manifest_version": 2,
  "name": "Disable Textarea Resize",
  "version": "1.0",
  "description": "Disables resizing of textarea elements",
  "browser_specific_settings": {
    "gecko": {
      "id": "disable-textarea-resize@company.local",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "collects": {
          "none": true
        }
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "content.css"
      ]
    }
  ]
}