Examine source code of PuzzleTab

{
  "manifest_version": 2,
  "name": "PuzzleTab",
  "version": "1.0",
  "description": "Show a random image from your library as a mini jigsaw puzzle on the New Tab page. Upload images via the extension popup.",
  "icons": {},
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_title": "PuzzleTab",
    "default_popup": "popup.html"
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d2dd8aab-0fb6-4652-a05a-7e3b474e789a}"
    }
  }
}