Examine source code of eBay Extension

{
  "manifest_version": 2,
  "name": "eBay Extension",
  "version": "1.0",
  "description": "Quick access to eBay search and deals.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{dc88f992-c9c4-4f3c-907a-61b8f6388a3c}"
    }
  }
}