Examine source code of Guitar & Harmonica

{
  "name": "Guitar & Harmonica",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "GuitarHarmonica-Header.jpg"
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgba(255, 248, 189, 1)",
      "frame": "#301907",
      "tab_background_text": "rgba(235, 224, 130, 1)"
    }
  }
}