Examine source code of narou-filter

{
  "manifest_version": 2,
  "name": "narou-filter",
  "description": "なろうの小説をフィルターする",
  "version": "2.0.0",
  "homepage_url": "https://github.com/furubarug/narou-filter",
  "icons": {
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png"
  },
  "permissions": [
    "storage",
    "https://api.syosetu.com/novelapi/api/**",
    "https://api.syosetu.com/userapi/api/**",
    "https://api.syosetu.com/rank/rankget/**"
  ],
  "options_ui": {
    "page": "options/options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "narou-filter@furubarug"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://yomou.syosetu.com/rank/genretop/",
        "https://yomou.syosetu.com/rank/top/",
        "https://yomou.syosetu.com/rank/isekaitop/"
      ],
      "js": [
        "RankTop.js"
      ]
    },
    {
      "matches": [
        "https://yomou.syosetu.com/rank/genrelist/**",
        "https://yomou.syosetu.com/rank/list/**",
        "https://yomou.syosetu.com/rank/isekailist/**"
      ],
      "js": [
        "RankList.js"
      ]
    },
    {
      "matches": [
        "https://yomou.syosetu.com/search.php**",
        "https://yomou.syosetu.com/search/**"
      ],
      "js": [
        "SearchList.js"
      ]
    }
  ]
}