Examine source code of FreeFire

{
  "name": "Free Fire",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "tema3.png"
    },
    "colors": {
      "toolbar": "rgba(128, 95, 95, 0)",
      "toolbar_field": "rgba(0, 0, 0, 0.28)",
      "toolbar_field_text": "rgba(43, 38, 38, 0.97)",
      "frame": "rgba(165, 166, 168, 0.97)",
      "tab_background_text": "rgba(28, 23, 23, 0.55)",
      "bookmark_text": "rgba(43, 42, 42, 0.89)"
    }
  }
}