Examine source code of Tempered Steel

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#6e6e6e",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Tempered Steel",
  "manifest_version": 2,
  "description": "A render from a blender project involving metal. It looked cool after compositing so here it is."
}