Examine source code of hltv remove forum

{
  "manifest_version": 2,
  "name": "hltv-no-forum",
  "version": "1.0",
  "description": "Removes Forum Sidebar from hltv.org",
  "content_scripts": [
    {
      "matches": [
        "*://*.hltv.org/*"
      ],
      "js": [
        "remove-forum.js"
      ]
    }
  ]
}