Examine source code of Cool Gamer

{
  "name": "Cool Gamer",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "cool-pictures-2018-2.jpg"
    },
    "colors": {
      "frame": "rgba(242, 9, 9, 1)",
      "tab_background_text": "rgba(235, 76, 14, 1)",
      "toolbar": "rgba(0, 0, 0, 1)",
      "bookmark_text": "rgba(235, 14, 14, 1)",
      "toolbar_field": "rgba(158, 158, 158, 1)",
      "toolbar_field_text": "rgba(250, 250, 250, 1)",
      "tab_line": "rgba(13, 255, 45, 1)"
    }
  }
}