Examine source code of Flashcard Manager

{
  "manifest_version": 2,
  "name": "Flashcard Manager",
  "version": "1.0",
  "description": "Create and manage flashcards for learning.",
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Flashcard Manager"
  },
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{303373e6-f4e2-4c32-b501-cf6c095aecaf}"
    }
  }
}