Examine source code of XtraMath Exporter

{
  "manifest_version": 2,
  "name": "XtraMath Exporter",
  "version": "1.0",
  "description": "Export XtraMath date reports as usable practice worksheets! Open date reports on new pages to generate!",
  "permissions": [
    "activeTab"
  ],
  "icons": {
    "48": "icon_xtramath.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://xtramath.org/*"
      ],
      "js": [
        "export.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b54cd988-6dd7-4320-bd6d-646e508d1d78}"
    }
  }
}