Examine source code of Trans Menu Hider

{
  "manifest_version": 2,
  "author": "Łukasz Wiśniewski",
  "name": "Trans Menu Hider",
  "description": "Hides side menu in Trans.eu platform, ukrywa boczne menu na platformie Transa",
  "version": "1.1",
  "icons": {
    "32": "icons/sidebarN.png",
    "128": "icons/main.png"
  },
  "browser_action": {
    "default_title": "Schowaj menu!"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://platform.trans.eu/*"
      ],
      "exclude_matches": [
        "https://platform.trans.eu/modules/*",
        "https://platform.trans.eu/login"
      ],
      "run_at": "document_idle",
      "js": [
        "content.js"
      ]
    }
  ]
}