Examine source code of Press Start

{
  "name": "Press Start",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "18c07437491fd6eff52d5fafe8fc58b0-ezgif.com-crop(2).gif"
    },
    "colors": {
      "frame": "rgba(10, 20, 51, 1)",
      "tab_background_text": "rgba(252, 156, 156, 1)",
      "toolbar": "rgba(255, 255, 255, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(255, 255, 255, 0)",
      "toolbar_field_text": "rgba(255, 82, 76, 1)",
      "tab_line": "rgba(255, 82, 76, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{203607e3-3d64-4508-8faf-09f516a4fd13}"
    }
  }
}