Examine source code of Grey and Red

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Grey and Red",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(210, 214, 212)",
      "toolbar_text": "rgb(78, 77, 77)",
      "frame": "rgb(235, 238, 236)",
      "tab_background_text": "rgb(78, 77, 77)",
      "toolbar_field": "rgb(245, 249, 247)",
      "toolbar_field_text": "rgb(78, 77, 77)",
      "tab_line": "rgb(125, 63, 61)",
      "popup": "rgb(235, 238, 236)",
      "popup_text": "rgb(78, 77, 77)",
      "tab_selected": "rgb(207, 119, 119)",
      "tab_text": "rgb(235, 241, 235)",
      "toolbar_bottom_separator": "rgb(204, 199, 199)",
      "toolbar_top_separator": "rgb(210, 214, 212)",
      "tab_loading": "rgb(125, 63, 61)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1c7a213f-5b48-49d7-b9bb-d20aedb5c153}"
    }
  }
}