Examine source code of Megumin

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Megumin",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(243, 236, 228, 0.73)",
      "toolbar_text": "rgb(163, 85, 93)",
      "frame": "rgb(197, 116, 125)",
      "tab_background_text": "rgb(116, 21, 30)",
      "toolbar_field": "rgba(197, 116, 125, 0.53)",
      "toolbar_field_text": "rgb(116, 21, 30)",
      "tab_line": "rgb(197, 116, 125)",
      "popup": "rgb(243, 236, 228)",
      "popup_text": "rgb(116, 21, 30)",
      "tab_loading": "rgb(197, 116, 125)"
    }
  }
}