Examine source code of Hollow Knight Simple

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Hollow Knight Simple",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(13, 13, 74, 0.11)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(12, 8, 71)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(85, 4, 185, 0.3)",
      "toolbar_field_text": "rgb(0, 178, 240)",
      "tab_line": "rgb(114, 5, 195)",
      "popup": "rgba(10, 23, 57, 0.84)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgba(72, 116, 116, 0.62)",
      "button_background_hover": "rgba(197, 199, 204, 0.12)",
      "frame_inactive": "rgb(28, 18, 87)",
      "icons_attention": "rgb(114, 5, 195)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgba(9, 20, 49, 0.96)",
      "ntp_text": "rgb(255, 255, 255)",
      "popup_highlight_text": "rgb(255, 255, 255)",
      "sidebar_highlight": "rgb(255, 255, 255)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(9, 20, 49)",
      "tab_background_separator": "rgb(114, 5, 195)",
      "tab_selected": "rgb(4, 20, 53)",
      "tab_text": "rgb(121, 232, 226)",
      "toolbar_field_text_focus": "rgba(0, 0, 0, 0.89)",
      "tab_loading": "rgb(114, 5, 195)"
    }
  }
}