Examine source code of BT21

{
  "name": "BT21",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "285c6a6397aa916898d0c264c5a5f23f (2).png"
    },
    "colors": {
      "frame": "rgba(255, 196, 226, 1)",
      "tab_background_text": "rgba(255, 112, 191, 1)",
      "toolbar": "rgba(255, 102, 179, 0.43)",
      "bookmark_text": "rgba(224, 141, 185, 1)",
      "toolbar_field": "rgba(255, 176, 216, 0.71)",
      "toolbar_field_text": "rgba(250, 82, 172, 0.41)"
    }
  }
}