Examine source code of sage beige

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "sage beige",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-009-f069b97f439938a011297c84464f0df6.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(210, 194, 178, 0.84)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(105, 119, 111)",
      "tab_background_text": "rgb(200, 200, 200)",
      "toolbar_field": "rgba(230, 226, 200, 0.62)",
      "toolbar_field_text": "rgb(116, 94, 96)",
      "tab_line": "rgb(174, 168, 148)",
      "popup": "rgb(155, 166, 156)",
      "popup_text": "rgb(116, 94, 96)",
      "tab_loading": "rgb(174, 168, 148)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d671bf26-3423-493c-a755-2dd953f8e20d}"
    }
  }
}