Examine source code of BecLink | Anchor handler

{
  "author": "Rafael Prenholato <rprenhol@gmail.com>",
  "description": "Manipulador dos links de busca do Catálogo de Materiais da BEC do Governo do Estado de São Paulo (https://www.bec.sp.gov.br)",
  "manifest_version": 2,
  "name": "BecLink | Manipulador de link",
  "homepage_url": "https://github.com/rprenhol/beclink",
  "version": "1.3.1",
  "icons": {
    "48": "icons/icon-48.png",
    "92": "icons/icon-92.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.bec.sp.gov.br/*"
      ],
      "js": [
        "js/beclink.js"
      ]
    }
  ]
}