Examine source code of Material Gruvbox

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Material Gruvbox",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-035-ec6e2e3635b86a13a7ebee9a1390e7e7.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(50, 48, 47)",
      "toolbar_text": "rgb(231, 138, 78)",
      "frame": "rgb(40, 40, 40)",
      "tab_background_text": "rgb(212, 190, 152)",
      "toolbar_field": "rgb(40, 40, 40)",
      "toolbar_field_text": "rgb(169, 182, 101)",
      "tab_line": "rgb(231, 138, 78)",
      "popup": "rgb(50, 48, 47)",
      "popup_text": "rgb(169, 182, 101)",
      "popup_border": "rgb(169, 182, 101)",
      "popup_highlight_text": "rgb(50, 48, 47)",
      "popup_highlight": "rgb(231, 138, 78)",
      "tab_loading": "rgb(231, 138, 78)",
      "toolbar_bottom_separator": "rgb(231, 138, 78)",
      "toolbar_field_border_focus": "rgb(169, 182, 101)",
      "toolbar_field_border": "rgb(40, 40, 40)",
      "toolbar_field_highlight_text": "rgb(40, 40, 40)",
      "toolbar_field_highlight": "rgb(125, 174, 163)",
      "toolbar_top_separator": "rgb(40, 40, 40)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{818ee01c-662a-4214-bea9-ee3b02c5d950}"
    }
  }
}