Examine source code of walk-federal

{
  "theme": {
    "images": {
      "theme_frame": "walk.jpg"
    },
    "colors": {
      "frame": "#f0f033",
      "tab_background_text": "#f2eded"
    }
  },
  "version": "2.0",
  "name": "walk-federal",
  "manifest_version": 2,
  "description": "This image by walk"
}