Examine source code of MTG Art Newtab

{
  "manifest_version": 2,
  "name": "MTG Art Newtab",
  "short_name": "MTG Art Tab",
  "version": "1.0.2",
  "description": "Replaces the newtab with art from card game Magic the Gathering.",
  "permissions": [
    "storage",
    "bookmarks"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  }
}