Examine source code of Landgrabber

{
  "applications": {
    "gecko": {
      "id": "landgrabber@aygun.dev"
    }
  },
  "description": "QoL improvements to landgrab.net",
  "manifest_version": 2,
  "name": "Landgrabber",
  "version": "2.1",
  "icons": {
    "48": "icons/landgrab.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://landgrab.net/landgrab/ViewBoard"
      ],
      "js": [
        "landgrabber.js"
      ]
    }
  ]
}