Examine source code of I love Rats

{
  "theme": {
    "images": {
      "theme_frame": "v_kapucni.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffdede"
    }
  },
  "version": "2.0",
  "name": "I love Rats",
  "manifest_version": 2,
  "description": "Slovenská Persona s mojimi, už teraz zosnulými samičkami potkana. Prvý pokus.\n_____\n\nSlovak Persona with my, now deceased female rats. First attempt."
}