Examine source code of Gruvbox Dark Medium

{
  "manifest_version": 2,
  "version": "1.3",
  "name": "Gruvbox Dark Medium",
  "theme": {
    "colors": {
      "toolbar": "#3c3836",
      "toolbar_text": "#d5c4a1",
      "frame": "#282828",
      "tab_background_text": "#a89984",
      "toolbar_field": "#504945",
      "toolbar_field_text": "#ebdbb2",
      "tab_line": "#d65d0e",
      "popup": "#282828",
      "popup_text": "#d5c4a1",
      "popup_highlight": "#a89984",
      "popup_highlight_text": "#282828",
      "button_background_active": "#d65d0e",
      "button_background_hover": "#665c54",
      "icons_attention": "#d65d0e",
      "icons": "#bdae93",
      "ntp_background": "#282828",
      "ntp_text": "#d5c4a1",
      "sidebar": "#3c3836",
      "tab_loading": "#d65d0e",
      "toolbar_bottom_separator": "#282828",
      "toolbar_field_border": "#282828",
      "toolbar_field_border_focus": "#d65d0e",
      "toolbar_top_separator": "#1d2021"
    }
  }
}