Examine source code of Vocaloid Chibi

{
  "name": "Vocaloid Chibi",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "FireFox_head_Vocaloid.png"
    },
    "colors": {
      "frame": "rgba(193, 229, 230, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(15, 178, 183, 0.7)",
      "bookmark_text": "rgba(0, 0, 0, 1)"
    }
  }
}