Examine source code of Griddle

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Griddle",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(57, 62, 70, 0.47)",
      "toolbar_text": "rgb(238, 238, 238)",
      "frame": "rgb(34, 40, 49)",
      "tab_background_text": "rgb(158, 158, 155)",
      "toolbar_field": "rgba(214, 90, 49, 0.51)",
      "toolbar_field_text": "rgb(238, 238, 238)",
      "tab_line": "rgb(214, 90, 49)",
      "popup": "rgb(49, 52, 58)",
      "popup_text": "rgb(173, 174, 176)",
      "tab_loading": "rgb(214, 90, 49)"
    }
  }
}