Examine source code of Simple Dark and Blue

{
  "name": "Simple Dark and Blue",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "102687.jpg"
    },
    "colors": {
      "frame": "rgba(33, 37, 46, 1)",
      "tab_background_text": "rgba(219, 219, 219, 1)",
      "toolbar": "rgba(55, 57, 66, 1)",
      "bookmark_text": "rgba(90, 101, 245, 1)",
      "toolbar_field": "rgba(29, 29, 46, 1)",
      "toolbar_field_text": "rgba(219, 219, 219, 1)"
    }
  }
}