Examine source code of Phrasal Verb Challenge

{
  "manifest_version": 2,
  "name": "Phrasal Verb Challenge",
  "version": "1.0",
  "description": "A fun and interactive browser extension to practice English phrasal verbs, helping language learners master their meanings and usage through engaging daily quizzes.",
  "icons": {
    "48": "phrasal_icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Phrasal Verb Challenge"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{12c09603-2aea-4b32-91de-5bda34aa866c}"
    }
  }
}