Examine source code of Gruvbox Dark Medium

{
  "manifest_version": 2,
  "version": "1.1.0",
  "name": "Gruvbox Dark Medium",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "frame": "#282828",
      "toolbar": "#3c3836",
      "toolbar_text": "#ebdbb2",
      "toolbar_field": "#282828",
      "toolbar_field_text": "#ebdbb2",
      "toolbar_top_separator": "#3c3836",
      "toolbar_bottom_separator": "#3c3836",
      "tab_background_text": "#a89984",
      "tab_line": "#689d6a",
      "tab_loading": "#689d6a",
      "popup": "#282828",
      "popup_text": "#ebdbb2",
      "ntp_background": "#282828",
      "ntp_text": "#ebdbb2",
      "sidebar": "#282828",
      "sidebar_border": "#3c3836",
      "sidebar_text": "#ebdbb2"
    }
  }
}