Examine source code of Art Blue

{
  "name": "Lowenbrau Art Blue",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Lowenbrau Art Blue.png"
    },
    "colors": {
      "toolbar_field_text": "rgba(15, 13, 13, 1)",
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(252, 247, 248, 1)",
      "bookmark_text": "rgba(245, 240, 240, 1)"
    }
  }
}