Examine source code of IDC

{
  "manifest_version": 2,
  "name": "IDC",
  "version": "1.4.2",
  "description": "디시인사이드 사용성 개선을 목표로",
  "permissions": [
    "storage",
    "tabs",
    "*://gall.dcinside.com/mgallery/board/view*",
    "*://gall.dcinside.com/mgallery/board/lists*",
    "*://gall.dcinside.com/board/lists*",
    "*://gall.dcinside.com/board/view*"
  ],
  "icons": {
    "48": "rsc/icons/48.png"
  },
  "page_action": {
    "browser_style": true,
    "default_popup": "popup/index.html",
    "default_icon": {
      "48": "rsc/icons/48.png"
    },
    "show_matches": [
      "*://gall.dcinside.com/board/lists*",
      "*://gall.dcinside.com/mgallery/board/lists*",
      "*://gall.dcinside.com/board/view*",
      "*://gall.dcinside.com/mgallery/board/view*"
    ]
  },
  "background": {
    "scripts": [
      "browser-polyfill.min.js",
      "background-script.bundle.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://gall.dcinside.com/board/lists*",
        "*://gall.dcinside.com/mgallery/board/lists*",
        "*://gall.dcinside.com/board/view*",
        "*://gall.dcinside.com/mgallery/board/view*"
      ],
      "js": [
        "browser-polyfill.min.js",
        "content-script.bundle.js"
      ],
      "css": [
        "css/base.css"
      ],
      "run_at": "document_start"
    }
  ]
}