Examine source code of Dark woodland forest

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Forest Dark",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(20, 20, 20)",
      "toolbar_text": "rgb(103, 125, 87)",
      "frame": "rgb(20, 20, 20)",
      "tab_background_text": "rgb(103, 125, 87)",
      "toolbar_field": "rgb(48, 52, 48)",
      "toolbar_field_text": "rgb(103, 125, 87)",
      "tab_line": "rgb(103, 125, 87)",
      "popup": "rgb(20, 20, 20)",
      "popup_text": "rgb(103, 125, 87)",
      "button_background_active": "rgb(52, 45, 29)",
      "button_background_hover": "rgba(148, 77, 0, 0.3)",
      "ntp_background": "rgb(20, 20, 20)",
      "ntp_text": "rgb(255, 255, 255)",
      "popup_border": "rgb(52, 45, 29)",
      "popup_highlight": "rgb(103, 125, 87)",
      "sidebar_border": "rgb(52, 45, 29)",
      "sidebar_text": "rgb(103, 125, 87)",
      "sidebar": "rgb(20, 20, 20)",
      "tab_selected": "rgb(20, 20, 20)",
      "toolbar_vertical_separator": "rgb(103, 125, 87)",
      "tab_loading": "rgb(103, 125, 87)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{89103a17-6d3e-48f4-9487-d1ed4898e39b}"
    }
  }
}