Examine source code of Synonym Scramble

{
  "manifest_version": 2,
  "name": "Synonym Scramble",
  "version": "1.0",
  "description": "A lively browser extension that challenges users to pick the correct synonym for a given word from two options. Perfect for language learners to boost vocabulary and synonym recognition through fun quizzes.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Synonym Scramble"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3fba62ca-1312-439a-80ef-09224af68149}"
    }
  }
}