Examine source code of 4chan colour theme

{
  "name": "gp3lynz4vdl61",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "gp3lynz4vdl61.jpg"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(255, 255, 238, 1)",
      "toolbar": "rgba(209, 213, 238, 1)",
      "toolbar_field": "rgba(254, 215, 176, 1)",
      "toolbar_field_text": "rgba(120, 153, 34, 1)",
      "tab_line": "rgba(255, 235, 107, 1)"
    }
  }
}