Examine source code of Window Resizer

{
  "manifest_version": 3,
  "name": "Window Resizer",
  "version": "2.0",
  "description": "Resize your browser window easily.",
  "permissions": [
    "activeTab"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "window-resizer-16_x_16.png",
      "48": "window-resizer-48_x_48.png",
      "128": "window-resizer-128_x_128.png"
    }
  },
  "icons": {
    "16": "window-resizer-16_x_16.png",
    "48": "window-resizer-48_x_48.png",
    "128": "window-resizer-128_x_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "windowresizer@eastbrightmarketing.com",
      "strict_min_version": "42.0"
    }
  }
}