Examine source code of Half-life

{
  "name": "Half-life",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Lambda_logo.png"
    },
    "colors": {
      "frame": "rgba(148, 108, 44, 1)",
      "tab_background_text": "rgba(237, 136, 35, 1)",
      "toolbar_field": "rgba(153, 76, 76, 0.19)",
      "toolbar_field_text": "rgba(186, 141, 17, 0.49)"
    }
  }
}