Examine source code of Black-Alex

{
  "name": "Black-Alex",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "carbon.jpg"
    },
    "colors": {
      "toolbar": "rgba(20, 20, 20, 1)",
      "toolbar_field": "rgba(66, 66, 66, 1)",
      "toolbar_field_text": "rgba(201, 201, 201, 1)",
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(201, 201, 201, 1)",
      "bookmark_text": "rgba(201, 201, 201, 1)"
    }
  }
}