Examine source code of Marvel Icons

{
  "theme": {
    "images": {
      "theme_frame": "BrowserHeaderMarvelIcons.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Marvel Icons",
  "manifest_version": 2,
  "description": "I created a black and dark grey gradient. I then put the marvel comics logo. I then put the 3 most iconic characters at Marvel Comic."
}