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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "APOD New Tab Page",
  "short_name": "APOD",
  "description": "Daily astronomy photos courtesy of NASA.",
  "version": "1.3",
  "manifest_version": 2,
  "permissions": [
    "storage"
  ],
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "icons": {
    "128": "icon.png"
  },
  "browser_action": {
    "default_title": "Toggle Description"
  }
}