Examine source code of Math Quick Test

{
  "manifest_version": 2,
  "name": "Math Quick Test",
  "version": "1.0",
  "description": "Sharpen your mind with quick math challenges! Solve random addition, subtraction, and multiplication problems before time runs out.",
  "icons": {
    "48": "math_icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Math Quick Test"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0f996524-7687-4573-a7c0-f2cbb384415c}"
    }
  }
}