Examine source code of Gray

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Gray",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-001-9c6d74e14860e77ee6f8f43e824bff25.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(52, 73, 85)",
      "toolbar_text": "rgb(246, 219, 229)",
      "frame": "rgb(81, 107, 123)",
      "tab_background_text": "rgb(153, 153, 153)",
      "toolbar_field": "rgba(196, 220, 252, 0.15)",
      "toolbar_field_text": "rgb(246, 219, 229)",
      "tab_line": "rgb(245, 236, 240)",
      "popup": "rgba(70, 76, 103, 0.46)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_hover": "rgb(255, 255, 255)",
      "icons": "rgb(246, 219, 229)",
      "tab_loading": "rgb(245, 236, 240)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{62142849-1d4f-4d59-8111-b038dd9b55d3}"
    }
  }
}