Examine source code of Reddit Arrow Navigator

{
  "manifest_version": 2,
  "name": "My Reddit Navigator",
  "version": "1.0",
  "description": "Navigate Reddit media posts with arrow keys",
  "author": "Dogan Teke",
  "homepage_url": "https://tec.nuxt.dev",
  "icons": {
    "48": "icons/icon-48x48.svg",
    "96": "icons/icon-96x96.png"
  },
  "permissions": [
    "*://*.reddit.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{196c89fc-c860-4719-8bbf-40457cabc9dc}"
    }
  }
}