Examine source code of Steampunkish

{
  "name": "Steampunkish",
  "manifest_version": 2,
  "version": "5.0",
  "theme": {
    "images": {
      "theme_frame": "tb.tools.breeze.steampunk.xx.iii.png"
    },
    "colors": {
      "toolbar": "rgba(79, 38, 17, 0.19)",
      "frame": "rgba(0, 0, 0, 0)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)"
    }
  }
}