Examine source code of Bright Plank

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Bright Plank",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgba(66, 25, 25, 0)",
      "toolbar_text": "rgb(255, 236, 216)",
      "frame": "rgb(145, 106, 68)",
      "tab_background_text": "rgb(255, 236, 216)",
      "toolbar_field": "rgb(255, 236, 216)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(255, 236, 216)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "button_background_active": "rgb(145, 106, 68)",
      "button_background_hover": "rgb(87, 31, 3)",
      "toolbar_field_focus": "rgb(251, 241, 230)",
      "toolbar_field_highlight_text": "rgb(0, 0, 0)",
      "toolbar_field_highlight": "rgb(222, 157, 94)",
      "toolbar_top_separator": "rgb(87, 31, 3)",
      "tab_loading": "rgb(255, 236, 216)"
    }
  }
}