Examine source code of Tab Reloder

{
  "manifest_version": 2,
  "name": "Tab Reloader",
  "version": "1.0",
  "description": "Reload tabs at custom intervals",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2af3fa08-0a55-455f-93f2-a891f825f3e7}"
    }
  }
}