Examine source code of BrickBadges

{
  "manifest_version": 2,
  "name": "BrickBadges",
  "description": "Get badges from game developers!",
  "version": "1.5",
  "content_scripts": [
    {
      "matches": [
        "https://www.brick-hill.com/user/*"
      ],
      "js": [
        "/content_script.js"
      ]
    }
  ]
}