Examine source code of Universal Tab Refresher

{
  "manifest_version": 2,
  "name": "Universal Tab Refresher",
  "version": "1.0",
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "main.js"
    ]
  },
  "browser_action": {
    "default_title": "Refresh All Tabs"
  },
  "description": "Refreshes all tabs in all windows at once.",
  "icons": {
    "32": "icon.svg",
    "64": "icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f09c9419-305b-4b51-bd4b-257ce3682068}"
    }
  }
}