Examine source code of TMNT City

{
  "name": "TMNT City",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "tmnt_city_edit.jpg"
    },
    "colors": {
      "frame": "rgba(108, 8, 214, 1)",
      "tab_background_text": "rgba(108, 8, 214, 1)",
      "toolbar": "rgba(6, 161, 125, 0.5)",
      "bookmark_text": "rgba(108, 8, 214, 1)",
      "toolbar_field": "rgba(77, 0, 153, 0.75)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 0.5)"
    }
  }
}