Examine source code of Plum BB

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Plum BB",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top",
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(252, 229, 237)",
      "toolbar_text": "rgb(252, 112, 159)",
      "frame": "rgb(218, 150, 189)",
      "tab_background_text": "rgb(90, 19, 51)",
      "toolbar_field": "rgb(169, 108, 132)",
      "toolbar_field_text": "rgb(250, 230, 223)",
      "tab_line": "rgb(253, 135, 182)",
      "popup": "rgb(169, 108, 132)",
      "popup_text": "rgb(255, 249, 247)",
      "icons_attention": "rgb(216, 173, 248)",
      "popup_border": "rgb(255, 249, 247)",
      "popup_highlight_text": "rgb(255, 255, 255)",
      "popup_highlight": "rgb(201, 201, 237)",
      "sidebar_border": "rgb(201, 201, 237)",
      "sidebar_text": "rgb(169, 108, 132)",
      "sidebar": "rgb(255, 249, 247)",
      "tab_loading": "rgb(255, 163, 204)",
      "toolbar_bottom_separator": "rgb(250, 230, 223)",
      "toolbar_field_border": "rgb(98, 38, 65)",
      "toolbar_field_highlight_text": "rgb(252, 229, 237)",
      "toolbar_field_highlight": "rgb(173, 161, 220)",
      "toolbar_top_separator": "rgb(126, 76, 97)"
    }
  }
}