Examine source code of Locomotive Train

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#3b3042",
      "tab_background_text": "#d2b437"
    }
  },
  "version": "2.0",
  "name": "Locomotive Train",
  "manifest_version": 2,
  "description": "This theme is from a photograph I took of a train / locomotive while exploring the Portland, Oregon suburbs and playing disc golf. Enjoy!"
}