Examine source code of BlackBlue

{
  "name": "BlackBlue",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "image_233431700.png"
    },
    "colors": {
      "frame": "rgba(104, 205, 230, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(55, 137, 214, 1)",
      "bookmark_text": "rgba(35, 35, 196, 1)",
      "toolbar_field": "rgba(32, 38, 217, 1)",
      "toolbar_field_text": "rgba(55, 137, 214, 1)"
    }
  }
}