Examine source code of GameBoy

{
  "name": "GameBoy",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "gameboy.png"
    },
    "colors": {
      "frame": "rgba(216, 215, 209, 1)",
      "tab_background_text": "rgba(22, 41, 161, 1)",
      "toolbar": "rgba(138, 140, 147, 1)",
      "bookmark_text": "rgba(36, 48, 127, 1)",
      "toolbar_field": "rgba(163, 198, 62, 1)",
      "toolbar_field_text": "rgba(1, 35, 29, 1)"
    }
  }
}