Examine source code of CustomOne

{
  "name": "CustomOne",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "FirefoxTheme1.png"
    },
    "colors": {
      "frame": "rgba(0, 18, 153, 0.63)",
      "tab_background_text": "rgba(87, 0, 0, 1)",
      "toolbar": "rgba(0, 0, 0, 0.23)",
      "bookmark_text": "rgba(87, 0, 0, 1)",
      "toolbar_field": "rgba(219, 0, 0, 0.53)",
      "toolbar_field_text": "rgba(0, 159, 191, 0.41)"
    }
  }
}