Examine source code of Red + Black Effect

{
  "name": "Red + Black Effect",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "4.jpg"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 0.57)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(0, 0, 0, 0.43)",
      "bookmark_text": "rgba(247, 10, 10, 1)",
      "toolbar_field": "rgba(25, 30, 66, 1)",
      "toolbar_field_text": "rgba(250, 5, 5, 1)"
    }
  }
}