Examine source code of Magic Landscape

{
  "theme": {
    "images": {
      "theme_frame": "PersonaFirefox_PaysageNeige_entete.png"
    },
    "colors": {
      "frame": "#9b91f9",
      "tab_background_text": "#cbc6ff"
    }
  },
  "version": "2.0",
  "name": "Magic Landscape",
  "manifest_version": 2,
  "description": "A magic polar landscape, with aurora borealis (or australis!) and stars.\nMy first Persona."
}