Examine source code of Bronze metal

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#181515",
      "tab_background_text": "#ffead9"
    }
  },
  "version": "2.0",
  "name": "Bronze metal",
  "manifest_version": 2,
  "description": "Abstract theme in muted brown tones. In it you can see the smoke, lightning, worn paper or moon. And sometimes sharp grain, for example, metal."
}