Examine source code of A spring day

{
  "name": "A spring day ",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "background 6.gif"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(41, 40, 40, 1)",
      "bookmark_text": "rgba(250, 250, 250, 1)",
      "toolbar_field": "rgba(66, 65, 65, 1)",
      "toolbar_field_text": "rgba(199, 199, 199, 1)"
    }
  }
}