Examine source code of brown and more brown

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "brown",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(49, 32, 29)",
      "toolbar_text": "rgb(219, 203, 200)",
      "frame": "rgb(17, 11, 10)",
      "tab_background_text": "rgb(234, 225, 223)",
      "toolbar_field": "rgb(17, 11, 10)",
      "toolbar_field_text": "rgb(234, 225, 223)",
      "tab_line": "rgb(39, 28, 26)",
      "popup": "rgb(48, 32, 29)",
      "popup_text": "rgb(200, 173, 167)",
      "ntp_background": "rgb(234, 225, 223)",
      "popup_border": "rgb(49, 32, 29)",
      "tab_selected": "rgb(70, 48, 45)",
      "tab_text": "rgb(200, 173, 167)",
      "toolbar_bottom_separator": "rgb(49, 32, 29)",
      "tab_loading": "rgb(39, 28, 26)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{956a13ff-9905-4029-b645-125944a567a1}"
    }
  }
}