Examine source code of Easy dccon

{
  "manifest_version": 2,
  "name": "Easy dccon",
  "version": "0.9.1",
  "icons": {
    "48": "48.png"
  },
  "description": "디시콘 30개 제한 우회(사용중인 콘 교체 자동화)&빠른 콘로딩",
  "content_scripts": [
    {
      "matches": [
        "*://gall.dcinside.com/*"
      ],
      "js": [
        "easy_dccon.js"
      ]
    }
  ],
  "permissions": [
    "*://gall.dcinside.com/*",
    "cookies"
  ],
  "web_accessible_resources": [
    "recent.png"
  ]
}