Examine source code of 17Lands Extensions

{
  "manifest_version": 2,
  "name": "17Lands Extensions",
  "version": "1.3.2",
  "description": "Extensions for 17Lands",
  "icons": {
    "32": "icons/17lands-extensions-32x32.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.17lands.com/*"
      ],
      "js": [
        "extensions.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5b097af0-1d1b-4c65-ac2b-7384cbdd19d0}"
    }
  }
}