Examine source code of Gruvbox Hard

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Humble Gruvbox",
  "theme": {
    "colors": {
      "frame": "#1D2021",
      "icons_attention": "#fabd2f",
      "ntp_background": "#1D2021",
      "ntp_text": "#fdf4c1",
      "popup": "#3c3836",
      "popup_border": "#1D2021",
      "popup_highlight": "#7c6f64",
      "popup_text": "#fdf4c1",
      "sidebar": "#1D2021",
      "sidebar_border": "#3c3836",
      "sidebar_highlight": "#7c6f64",
      "sidebar_text": "#fdf4c1",
      "tab_background_separator": "black",
      "tab_line": "#1D2021",
      "tab_loading": "#fabd2f",
      "tab_text": "#fabd2f",
      "tab_background_text": "#fdf4c1",
      "toolbar": "#1D2021",
      "toolbar_field": "black",
      "toolbar_field_border_focus": "#fabd2f",
      "toolbar_field_separator": "black",
      "toolbar_field_text": "#fdf4c1",
      "toolbar_text": "#fdf4c1",
      "toolbar_vertical_separator": "#1D2021"
    }
  }
}