Examine source code of VocabVoyage

{
  "manifest_version": 2,
  "name": "VocabVoyage",
  "version": "1.0",
  "description": "A delightful browser popup game to boost your Vietnamese-to-English vocabulary. Challenge yourself by translating everyday Vietnamese nouns into English, perfect for language learners aiming to enrich their word knowledge interactively.",
  "icons": {
    "48": "vocabvoyage_icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "VocabVoyage"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9c8d4e3f-2b1a-4f7c-8e9d-6a5b3c2d1e0f}"
    }
  }
}