Examine source code of Lighthouse 3

{
  "theme": {
    "images": {
      "theme_frame": "Lighthouse3.JPG"
    },
    "colors": {
      "frame": "#caf2ac",
      "tab_background_text": "#eff7a6"
    }
  },
  "version": "2.0",
  "name": "Lighthouse 3",
  "manifest_version": 2
}