Examine source code of Arrows for PL-Tools

{
  "manifest_version": 3,
  "name": "Arrows for PL-Tools",
  "description": "Enables movement between cells with arrow keys",
  "version": "1.0.0",
  "author": "me@cristimacovei.dev",
  "content_scripts": [
    {
      "matches": [
        "https://alin1popa.github.io/pl-tools/*"
      ],
      "js": [
        "build/content/arrows.js"
      ]
    }
  ],
  "host_permissions": [
    "https://alin1popa.github.io/pl-tools/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "arrows-for-pl-tools@cristimacovei.dev",
      "strict_min_version": "42.0"
    }
  }
}