Examine source code of GMAT Prep Calculator

{
  "manifest_version": 2,
  "name": "GMAT Prep Calculator",
  "description": "This extension shows a standard GMAT Calculator used for prep tests",
  "version": "1.3resigned1",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1d42ab99-8ba4-4ddf-adf0-3fe1b36ddf2f}"
    }
  }
}