Examine source code of Romantic Sunset..

{
  "name": "Romantic Sunset..",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "RomanticSunsetH.jpg"
    },
    "colors": {
      "frame": "rgba(150, 35, 0, 1)",
      "tab_background_text": "rgba(245, 245, 161, 1)",
      "toolbar": "rgba(153, 41, 0, 0)",
      "bookmark_text": "rgba(255, 249, 168, 1)",
      "toolbar_field": "rgba(71, 44, 35, 0.08)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{58f3e73e-40ef-48ed-87a9-06bbcd9d24b9}"
    }
  }
}