Examine source code of Superhero Collection

{
  "theme": {
    "images": {
      "theme_frame": "superherocollection.jpg"
    },
    "colors": {
      "frame": "#6e6e6e",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Superhero Collection",
  "manifest_version": 2,
  "description": "superhero of the decade.\nironman\nhulk\nhalo\nsuperman\nsilversurffer\nbatman\nspiderman\nbumbulbee\nfirefox\n\n\ncreated by  theshivamsharma\nby"
}