Examine source code of Blue Night

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Blue Night",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(13, 17, 49)",
      "toolbar_text": "rgb(180, 192, 207)",
      "frame": "rgb(13, 17, 49)",
      "tab_background_text": "rgb(209, 210, 211)",
      "toolbar_field": "rgb(15, 20, 59)",
      "toolbar_field_text": "rgb(113, 155, 176)",
      "tab_line": "rgb(105, 11, 11)",
      "popup": "rgb(13, 17, 49)",
      "popup_text": "rgb(191, 205, 221)",
      "tab_loading": "rgb(105, 11, 11)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{81e3375f-c74e-414d-a3d1-977ea19bf13e}"
    }
  }
}