Examine source code of Readesh New Tab

{
  "name": "Dragon Ball Super HD Theme",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "wallpaperflare.com_wallpaper (8).jpg"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(33, 189, 224, 1)",
      "bookmark_text": "rgba(255, 240, 240, 1)",
      "toolbar_field": "rgba(31, 207, 154, 1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{859e68be-b5b2-4905-9391-62ab69550a7f}"
    }
  }
}