Examine source code of Dark BLood Forest

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Forest 2",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(254, 254, 254, 0)",
      "toolbar_text": "rgb(218, 211, 211)",
      "frame": "rgb(171, 177, 177)",
      "tab_background_text": "rgb(172, 174, 175)",
      "toolbar_field": "rgba(92, 29, 29, 0.84)",
      "toolbar_field_text": "rgb(217, 219, 224)",
      "tab_line": "rgb(70, 32, 40)",
      "popup": "rgb(44, 14, 14)",
      "popup_text": "rgb(233, 233, 237)",
      "tab_loading": "rgb(70, 32, 40)"
    }
  }
}