Shooter Game Popup

manifest.json

{
  "manifest_version": 3,
  "name": "Shooter Game Popup",
  "version": "1.0",
  "description": "When you click the icon, a shooter game pops up!\n Use LEFT/RIGHT arrows to move.\n Hit ENTER to play again.\n You will get stronger over time... but so will the zombies! \n Made with JavaScript.",
  "icons": {
    "16": "16.png",
    "32": "32.png",
    "48": "48.png",
    "128": "128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "action": {
    "default_popup": "index.html",
    "default_icon": {
      "16": "16.png",
      "32": "32.png",
      "48": "48.png",
      "128": "128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a83fd114-6159-4813-a8fb-2fd59b62f67e}"
    }
  }
}