Examine source code of Beautiful Gruvbox

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Gruvbox Dark Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-013-06591d4ad28ab7b9ee90f62f81d6b505.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(40, 40, 40)",
      "toolbar_text": "rgb(238, 224, 183)",
      "frame": "rgb(40, 40, 40)",
      "tab_background_text": "rgb(238, 224, 183)",
      "toolbar_field": "rgb(55, 55, 55)",
      "toolbar_field_text": "rgb(238, 224, 183)",
      "tab_line": "rgb(81, 79, 70)",
      "popup": "rgb(47, 47, 47)",
      "popup_text": "rgb(238, 224, 183)",
      "button_background_active": "rgb(59, 59, 59)",
      "ntp_background": "rgb(40, 40, 40)",
      "popup_border": "rgb(84, 84, 84)",
      "popup_highlight_text": "rgb(238, 224, 183)",
      "popup_highlight": "rgb(115, 107, 86)",
      "sidebar_border": "rgb(115, 107, 86)",
      "sidebar_highlight_text": "rgb(238, 224, 183)",
      "sidebar_highlight": "rgb(238, 224, 183)",
      "tab_selected": "rgb(46, 46, 46)",
      "toolbar_bottom_separator": "rgb(40, 40, 40)",
      "toolbar_field_border_focus": "rgb(115, 107, 86)",
      "toolbar_field_highlight_text": "rgb(61, 61, 61)",
      "toolbar_field_highlight": "rgb(238, 224, 183)",
      "toolbar_top_separator": "rgb(55, 55, 55)",
      "tab_loading": "rgb(81, 79, 70)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{29c9e634-2ec5-4b93-999b-426307a99dd1}"
    }
  }
}