Examine source code of Bestia 2

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Bestia 2",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(27, 40, 45, 0.42)",
      "toolbar_text": "rgb(48, 158, 233)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(60, 244, 116)",
      "popup": "rgb(27, 40, 45)",
      "popup_text": "rgba(119, 186, 232, 0.82)",
      "tab_selected": "rgba(62, 233, 113, 0.57)",
      "tab_text": "rgb(35, 36, 35)",
      "tab_loading": "rgb(60, 244, 116)"
    }
  }
}