Examine source code of Scheduled Refresh

{
  "manifest_version": 2,
  "name": "Scheduled Refresh",
  "version": "1.0.0",
  "description": "Automatically reload the current tab on a configurable timer from 5 seconds to 10 minutes. Optional inactive-only mode.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{938dbc1e-0477-4328-a22b-ce928b23f6fd}",
      "strict_min_version": "96.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "browser_action": {
    "default_icon": {
      "16": "images/icon16.png",
      "32": "images/icon32.png",
      "48": "images/icon48.png",
      "96": "images/icon96.png",
      "128": "images/icon128.png"
    },
    "default_title": "Scheduled Refresh",
    "default_popup": "ext/popup.html"
  },
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "96": "images/icon96.png",
    "128": "images/icon128.png"
  },
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "ext/background.js"
    ],
    "persistent": false
  }
}