Examine source code of Gmail Hide

{
  "name": "Gmail Hide",
  "description": "Hide gmail",
  "version": "1.0.2",
  "manifest_version": 2,
  "content_scripts": [
    {
      "js": [
        "content_script.js"
      ],
      "css": [
        "main.css"
      ],
      "matches": [
        "https://mail.google.com/mail/*"
      ],
      "exclude_matches": [
        "https://mail.google.com/mail/u/0/?ui=2*"
      ],
      "run_at": "document_end"
    }
  ]
}