Examine source code of Dark L20 Brown

{
  "manifest_version": 2,
  "name": "Dark L20 Brown",
  "version": "1.0",
  "description": "A simple dark theme with brown colour scheme.",
  "author": "W5nH6o",
  "theme": {
    "colors": {
      "frame": "rgb(27, 20, 14)",
      "frame_inactive": "rgb(40, 29, 21)",
      "toolbar": "rgb(66, 49, 36)",
      "tab_text": "rgb(229, 229, 229)",
      "tab_background_text": "rgb(177, 177, 179)",
      "bookmark_text": "rgb(229, 229, 229)",
      "ntp_background": "rgb(27, 20, 14)",
      "ntp_text": "rgb(190, 190, 190)",
      "tab_line": "rgb(66, 49, 36)",
      "toolbar_field": "rgb(27, 20, 14)",
      "toolbar_field_focus": "rgb(17, 12, 9)",
      "toolbar_field_text": "rgb(229, 229, 229)",
      "popup": "rgb(40, 29, 21)",
      "popup_border": "rgb(66, 49, 36)",
      "popup_text": "rgb(229, 229, 229)",
      "sidebar": "rgb(40, 29, 21)",
      "sidebar_border": "rgb(66, 49, 36)",
      "sidebar_text": "rgb(229, 229, 229)"
    }
  }
}