Examine source code of incuff

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#090c2e",
      "tab_background_text": "#dfe0e8"
    }
  },
  "version": "2.0",
  "name": "incuff",
  "manifest_version": 2
}