Examine source code of google-keyboard-shortcuts

{
  "manifest_version": 3,
  "name": "google-keyboard-shortcuts",
  "version": "1.0.0",
  "description": "Use j/k or arrow keys to navigate Google search results",
  "icons": {
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.google.com/search*"
      ],
      "js": [
        "plugin.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "google-keyboard-shortcuts@boon",
      "strict_min_version": "110.0"
    }
  }
}