Examine source code of Trees Monochrome

{
  "theme": {
    "images": {
      "theme_frame": "trees_header.jpg"
    },
    "colors": {
      "frame": "#363636",
      "tab_background_text": "#bdbdbd"
    }
  },
  "version": "2.0",
  "name": "Trees Monochrome",
  "manifest_version": 2,
  "description": "Monochrome trees"
}