Examine source code of YoungNight

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "YoungNight",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(21, 24, 41)",
      "toolbar_text": "rgb(209, 207, 255)",
      "frame": "rgb(23, 23, 23)",
      "tab_background_text": "rgb(140, 140, 140)",
      "toolbar_field": "rgb(28, 32, 55)",
      "toolbar_field_text": "rgb(209, 207, 255)",
      "tab_line": "rgb(152, 64, 211)",
      "popup": "rgb(38, 30, 41)",
      "popup_text": "rgb(193, 193, 219)",
      "popup_border": "rgb(0, 0, 0)",
      "sidebar_border": "rgb(0, 0, 0)",
      "toolbar_field_border_focus": "rgb(136, 77, 176)",
      "toolbar_field_focus": "rgb(37, 42, 78)",
      "toolbar_field_highlight": "rgb(10, 19, 70)",
      "toolbar_field_text_focus": "rgb(209, 207, 255)",
      "tab_loading": "rgb(152, 64, 211)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c8c6cfc6-0b27-4717-9ee5-b26f5ce5b1ca}"
    }
  }
}