Examine source code of FornPunkt

{
  "manifest_version": 2,
  "name": "FornPunkt",
  "description": "Browser add-on which enables users to access FornPunkt(fornpunkt.se) directly from the Swedish National Heritage Board's Fornsök service.",
  "version": "1.2.0",
  "icons": {
    "64": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://app.raa.se/open/fornsok/*"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d59f67e3-83f6-4445-8e40-95e9e027557e}"
    }
  }
}