Examine source code of Hex/Bin/Oct/Dec Converter

{
  "manifest_version": 2,
  "name": "Number Converter",
  "version": "1.0",
  "description": "Convert numbers between hex, bin, oct, and dec.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "converter.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d408ef11-8225-4bb1-8707-e6101600c058}"
    }
  }
}