Examine source code of Clear Cache & Reload

{
  "manifest_version": 2,
  "name": "Clear Cache & Reload",
  "version": "1.0",
  "description": "One-click button to clear site cache and reload the page.",
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Clear Cache & Reload",
    "default_icon": {
      "16": "icons/clear.png",
      "32": "icons/clear.png",
      "48": "icons/clear.png",
      "128": "icons/clear.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9cbf7671-083a-4f02-adb3-0ce5851efd8a}"
    }
  }
}