Examine source code of DCRefresher Reborn

{
  "manifest_version": 2,
  "name": "DCRefresher Reborn",
  "description": "디시인사이드 개선 확장 프로그램",
  "version": "5.0.2",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage",
    "scripting",
    "unlimitedStorage",
    "clipboardWrite",
    "https://*.dcinside.com/*"
  ],
  "web_accessible_resources": [
    "assets/*.webp"
  ],
  "commands": {
    "refreshLists": {
      "suggested_key": {
        "default": "Alt+R"
      },
      "description": "글 목록 새로고침: 새로고침"
    },
    "refreshPause": {
      "suggested_key": {
        "default": "Alt+S"
      },
      "description": "글 목록 새로고침: 일시 비활성화"
    },
    "stealthPause": {
      "suggested_key": {
        "default": "Alt+P"
      },
      "description": "스텔스 모드: 일시 비활성화"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "dcrefresher-reborn@green1052"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "DCRefresher Reborn",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.dcinside.com/*"
      ],
      "exclude_matches": [
        "https://event.dcinside.com/*",
        "https://h5.dcinside.com/*",
        "https://m.dcinside.com/*",
        "https://mall.dcinside.com/*",
        "https://wiki.dcinside.com/*"
      ],
      "run_at": "document_start",
      "css": [
        "content-scripts/content.css"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    },
    {
      "matches": [
        "https://*.dcinside.com/*"
      ],
      "exclude_matches": [
        "https://event.dcinside.com/*",
        "https://h5.dcinside.com/*",
        "https://m.dcinside.com/*",
        "https://mall.dcinside.com/*",
        "https://wiki.dcinside.com/*"
      ],
      "run_at": "document_end",
      "js": [
        "content-scripts/grecaptcha.js"
      ],
      "world": "MAIN"
    }
  ]
}