Examine source code of Nineties

{
  "manifest_version": 2,
  "name": "Nineties",
  "version": "1.2",
  "description": "Turns any page you visit into an early web website",
  "icons": {
    "48": "icons/logo-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": {
      "32": "icons/logo-32.png",
      "48": "icons/logo-48.png"
    },
    "default_title": "Nineties",
    "default_popup": "popup/ninetiesPopup.html"
  }
}