Examine source code of Birdspiders

{
  "theme": {
    "images": {
      "theme_frame": "Birdspiders.jpg"
    },
    "colors": {
      "frame": "#0ef2ee",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Birdspiders",
  "manifest_version": 2,
  "description": "Vogelspinnen, Lampropelma, Auratum, Versicolor, Irminia, Murinus, Blondi, Regalis, Smithi, Metallica, Geniculatus"
}