Examine source code of MateriaGruvbox

{
  "manifest_version": 2,
  "version": "3.2",
  "name": "MateriaGruvbox",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "#282828",
      "toolbar_text": "#a89985",
      "frame": "#282828",
      "tab_background_text": "#7c6f65",
      "toolbar_field": "#3c3836",
      "toolbar_field_text": "#ebdbb2",
      "toolbar_field_border_focus": "#689d6a",
      "popup": "#282828",
      "popup_text": "#a89985",
      "popup_highlight": "#689d6a",
      "popup_highlight_text": "#ebdbb2",
      "tab_line": "#689d6a",
      "tab_loading": "#f84b3c",
      "ntp_background": "#282828",
      "ntp_text": "#a89985"
    }
  }
}