Examine source code of Tab Restore Button

{
  "manifest_version": 2,
  "name": "Tab Restore Button",
  "version": "1.0",
  "description": "Restore the last closed tab with one click or choose from recently closed tabs.",
  "permissions": [
    "sessions",
    "tabs"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "64": "icon64.png",
      "128": "icon128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{457f9e2f-75aa-485a-bff4-e06a2c8c1426}",
      "strict_min_version": "109.0"
    }
  }
}