Examine source code of Makkuro

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Makkuro",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-036-40a272fe657f748396e017c7a64ee2dc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(64, 64, 64, 0.5)",
      "toolbar_text": "rgb(242, 242, 242)",
      "frame": "rgb(64, 64, 64)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(64, 64, 64)",
      "toolbar_field_text": "rgb(242, 242, 242)",
      "tab_line": "rgb(246, 10, 32)",
      "popup": "rgb(64, 64, 64)",
      "popup_text": "rgb(242, 242, 242)",
      "popup_highlight_text": "rgb(242, 242, 242)",
      "popup_highlight": "rgba(246, 10, 32, 0.9)",
      "sidebar_border": "rgba(242, 242, 242, 0.5)",
      "sidebar_highlight": "rgba(220, 220, 220, 0)",
      "sidebar_text": "rgb(242, 242, 242)",
      "sidebar": "rgb(64, 64, 64)",
      "toolbar_bottom_separator": "rgb(189, 184, 184)",
      "toolbar_field_border_focus": "rgba(242, 242, 242, 0.5)",
      "toolbar_field_border": "rgba(242, 242, 242, 0)",
      "toolbar_field_focus": "rgb(64, 64, 64)",
      "toolbar_field_highlight_text": "rgba(126, 80, 79, 0)",
      "toolbar_field_text_focus": "rgb(242, 242, 242)",
      "toolbar_top_separator": "rgb(64, 64, 64)",
      "tab_loading": "rgb(246, 10, 32)",
      "ntp_background": "rgb(64, 64, 64)",
      "ntp_text": "rgb(242, 242, 242)"
    }
  }
}