Examine source code of Ranboo Background

{
  "name": "Ranboo Background",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Ranboo Background.png"
    },
    "colors": {
      "frame": "rgba(26, 28, 31, 1)",
      "tab_background_text": "rgba(30, 173, 22, 1)",
      "toolbar": "rgba(18, 17, 17, 1)",
      "bookmark_text": "rgba(235, 28, 21, 1)",
      "toolbar_field": "rgba(10, 9, 9, 1)",
      "toolbar_field_text": "rgba(15, 138, 12, 1)",
      "tab_line": "rgba(235, 28, 21, 1)"
    }
  }
}