Examine source code of refreshinator

{
  "manifest_version": 2,
  "name": "refreshinator",
  "version": "0.0.2",
  "description": "Refreshes a specified tab non-invasively,  option to clear cache",
  "icons": {
    "128": "refreshinator.png"
  },
  "browser_action": {
    "default_icon": "refreshinator.png",
    "default_title": "Non-invasive auto-refresher with cache option",
    "default_popup": "popup.html"
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3e294c42-4281-4eb8-9084-46a83cd8378f}"
    }
  }
}