Examine source code of aesthetic_theme

{
  "name": "6315",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "6315.jpg"
    },
    "colors": {
      "frame": "rgba(240, 240, 240, 1)",
      "tab_background_text": "rgba(0, 64, 5, 1)",
      "bookmark_text": "rgba(230, 21, 21, 1)",
      "toolbar_field": "rgba(0, 5, 158, 1)",
      "toolbar_field_text": "rgba(207, 101, 101, 1)"
    }
  }
}