Examine source code of Tab Wallpaper Previewer

{
  "manifest_version": 3,
  "name": "Tab Wallpaper Previewer",
  "version": "1.0",
  "description": "Generate quick wallpaper previews from the current tab's background image. Crops 16:9, 9:16, 1:1.",
  "action": {
    "default_title": "Wallpaper Preview",
    "default_popup": "popup.html"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "scripting"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "tabwallpaperpre@local",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}