Examine source code of MB Beige

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "MB Beige",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(255, 255, 255)",
      "toolbar_text": "rgb(71, 71, 71)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(46, 46, 46)",
      "toolbar_field": "rgb(204, 196, 184)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(41, 41, 41)",
      "icons": "rgb(119, 115, 103)",
      "tab_selected": "rgb(203, 196, 185)",
      "tab_text": "rgb(0, 0, 0)",
      "toolbar_bottom_separator": "rgb(255, 255, 255)",
      "toolbar_field_border": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgb(255, 255, 255)",
      "toolbar_vertical_separator": "rgb(255, 255, 255)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7f63e871-5670-41d3-9075-283630e91429}"
    }
  }
}