Examine source code of Uckermark

{
  "name": "Uckermark",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "454e70ed09b0be54ccb06c98a0ca14c5.png"
    },
    "colors": {
      "frame": "rgba(46, 49, 54, 1)",
      "tab_background_text": "rgba(237, 218, 218, 1)",
      "toolbar": "rgba(46, 41, 41, 1)",
      "bookmark_text": "rgba(223, 192, 224, 1)",
      "toolbar_field": "rgba(39, 48, 51, 1)",
      "toolbar_field_text": "rgba(205, 214, 222, 1)"
    }
  }
}