Examine source code of clasiccmusic

{
  "name": "it",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "playlist.gif"
    },
    "colors": {
      "frame": "rgba(36, 29, 18, 1)",
      "tab_background_text": "rgba(255, 158, 158, 1)",
      "toolbar": "rgba(255, 59, 59, 0)",
      "bookmark_text": "rgba(135, 62, 62, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0.31)",
      "toolbar_field_text": "rgba(120, 46, 46, 0.93)"
    }
  }
}