Examine source code of Winter Calm

{
  "name": "Winter Calm",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "header.PNG"
    },
    "colors": {
      "frame": "rgba(92, 110, 158, 1)",
      "tab_background_text": "rgba(151, 167, 203, 1)",
      "toolbar": "rgba(151, 167, 203, 1)",
      "bookmark_text": "rgba(125, 84, 84, 1)",
      "toolbar_field": "rgba(181, 83, 83, 1)",
      "toolbar_field_text": "rgba(186, 84, 84, 1)",
      "tab_line": "rgba(161, 58, 58, 1)"
    }
  }
}