Examine source code of Novelpia Auto Recommend

{
  "manifest_version": 2,
  "name": "Novelpia Auto Recommend",
  "version": "1.4.1",
  "description": "노벨피아에서 자동으로 추천 버튼을 클릭합니다.",
  "permissions": [
    "storage",
    "activeTab",
    "https://novelpia.com/viewer/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "16": "icons/icon_on_16.png",
    "48": "icons/icon_on_48.png",
    "128": "icons/icon_on_128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon_off_16.png",
      "48": "icons/icon_off_48.png",
      "128": "icons/icon_off_128.png"
    },
    "default_title": "추천 자동 클릭"
  },
  "content_scripts": [
    {
      "matches": [
        "https://novelpia.com/viewer/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "me@aleu.xyz"
    }
  }
}