Examine source code of BlueBlack78

{
  "name": "BLUE&BLACK",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "3.jpg"
    },
    "colors": {
      "toolbar": "rgba(47, 87, 173, 1)",
      "toolbar_field": "rgba(3, 3, 3, 1)",
      "toolbar_field_text": "rgba(102, 98, 98, 1)",
      "frame": "rgba(10, 26, 148, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "bookmark_text": "rgba(0, 0, 0, 1)"
    }
  }
}