Examine source code of Flashcard Tab

{
  "manifest_version": 2,
  "name": "Flashcard Tab",
  "version": "1.0",
  "description": "Display a random flashcard each time a new tab is opened to help with memory retention.",
  "chrome_url_overrides": {
    "newtab": "flashcard.html"
  },
  "permissions": [],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{272fed61-e2c2-4811-96f9-d1b7523f1095}"
    }
  }
}