Examine source code of Dark Gray by Snake

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Dark Gray by Snake",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(44, 44, 58)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(67, 67, 84)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(61, 61, 69)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(35, 205, 179)",
      "popup": "rgb(58, 57, 69)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_hover": "rgb(91, 91, 101)",
      "icons_attention": "rgb(0, 215, 255)",
      "popup_highlight": "rgb(71, 70, 87)",
      "toolbar_top_separator": "rgb(113, 113, 113)",
      "tab_loading": "rgb(35, 205, 179)"
    }
  }
}