Examine source code of Mushyroom

{
  "theme": {
    "images": {
      "theme_frame": "Newcanvas.png"
    },
    "colors": {
      "frame": "#de8ca1",
      "tab_background_text": "#8cc9b2"
    }
  },
  "version": "2.0",
  "name": "Mushyroom",
  "manifest_version": 2,
  "description": "My favorite."
}