Examine source code of citytheme1

{
  "name": "citytheme1",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "citytheme1.jpg"
    },
    "colors": {
      "frame": "rgba(15, 46, 120, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(88, 131, 219, 1)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(0, 0, 0, 1)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(3, 3, 3, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{44c50370-3ad5-4108-adc5-0fab725bfeab}"
    }
  }
}