Examine source code of HackTheBox v0.4

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "HackTheBox v0.4",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center",
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(20, 29, 43)",
      "toolbar_text": "rgb(208, 208, 208)",
      "frame": "rgb(13, 17, 23)",
      "tab_background_text": "rgb(204, 204, 204)",
      "toolbar_field": "rgb(48, 57, 75)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(182, 255, 45)",
      "popup": "rgb(22, 27, 34)",
      "popup_text": "rgb(221, 221, 221)",
      "icons": "rgb(167, 254, 64)",
      "ntp_background": "rgb(18, 24, 31)",
      "popup_border": "rgb(118, 255, 222)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_field_border": "rgb(79, 112, 255)",
      "toolbar_field_focus": "rgb(22, 27, 34)",
      "toolbar_field_highlight": "rgb(6, 8, 3)",
      "toolbar_field_text_focus": "rgb(227, 221, 237)",
      "tab_loading": "rgb(182, 255, 45)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{aac8e59e-b74e-4de4-a84d-bce09c195078}"
    }
  }
}