Examine source code of Super Refresh

{
  "manifest_version": 2,
  "name": "Super Refresh",
  "version": "1.0",
  "description": "Reload all open tabs instantly.",
  "icons": {
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon64.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f909bd25-460b-423f-89fc-03ea7472592f}",
      "strict_min_version": "120.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}