Examine source code of CSS Disabler

{
  "manifest_version": 3,
  "name": "CSS Disabler",
  "version": "1.0",
  "description": "Disable all CSS on any web page with a single click",
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "css-disabler@extensions.local",
      "strict_min_version": "109.0"
    }
  }
}