Examine source code of WindowCatSeasonGreetings

{
  "theme": {
    "images": {
      "theme_frame": "birdwatchingwinter.jpg"
    },
    "colors": {
      "frame": "#732828",
      "tab_background_text": "#2a2b2b"
    }
  },
  "version": "2.0",
  "name": "WindowCatSeasonGreetings",
  "manifest_version": 2,
  "description": "cat looking at cardinal from frosted window\nWinter Christmas theme"
}