Examine source code of Balthazar

{
  "name": "Balthazar",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "scène de jules.jpg"
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.53)",
      "toolbar_field": "rgba(0, 0, 0, 1)",
      "toolbar_field_text": "rgba(76, 97, 181, 0.86)",
      "frame": "rgba(40, 148, 184, 0.79)",
      "tab_background_text": "rgba(220, 218, 237, 0.73)",
      "bookmark_text": "rgba(40, 81, 191, 0.67)"
    }
  }
}