Examine source code of American flag123

{
  "theme": {
    "images": {
      "theme_frame": "flagtheme.jpg"
    },
    "colors": {
      "frame": "#e3caca",
      "tab_background_text": "#141313"
    }
  },
  "version": "2.0",
  "name": "American flag123",
  "manifest_version": 2
}