Examine source code of Quick Zoom

{
  "manifest_version": 2,
  "name": "Quick Zoom",
  "version": "1.0",
  "description": "Quickly adjust the zoom level on any webpage.",
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icons/zoom-48.png",
    "default_popup": "popup.html",
    "default_title": "Quick Zoom"
  },
  "icons": {
    "48": "icons/zoom-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b8cc5459-2f1d-434c-95a2-fcf8c261d464}"
    }
  }
}