Examine source code of kropeczki

{
  "theme": {
    "images": {
      "theme_frame": "Bez_tytuu_1.jpg"
    },
    "colors": {
      "frame": "#f7f2f2",
      "tab_background_text": "#f0ebeb"
    }
  },
  "version": "2.0",
  "name": "kropeczki",
  "manifest_version": 2,
  "description": "kolorowe kropeczki na czarnym tle"
}