Examine source code of Boojum

{
  "manifest_version": 2,
  "version": "1.3",
  "name": "Boojum",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(240, 240, 240, 0.25)",
      "toolbar_text": "rgb(222, 222, 222)",
      "frame": "rgb(50, 50, 50)",
      "tab_background_text": "rgb(222, 222, 222)",
      "toolbar_field": "rgb(222, 222, 222)",
      "toolbar_field_text": "rgb(32, 32, 32)",
      "tab_line": "rgb(222, 222, 222)",
      "popup": "rgb(50, 50, 50)",
      "popup_text": "rgb(222, 222, 222)",
      "ntp_text": "rgb(240, 240, 240)",
      "tab_loading": "rgb(222, 222, 222)"
    }
  }
}