Examine source code of Novel Speech

{
  "manifest_version": 3,
  "name": "Novel Speech",
  "version": "1.26.0",
  "description": "Web小説サイトで音声による小説の読み上げができます",
  "browser_specific_settings": {
    "gecko": {
      "id": "{00bc1b49-5716-4362-83f5-9b624600c6ee}"
    }
  },
  "icons": {
    "16": "images/sp16.png",
    "48": "images/sp48.png",
    "128": "images/sp128.png"
  },
  "action": {
    "default_title": "Web小説読み上げ"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "*://ncode.syosetu.com/*/*",
        "*://novel18.syosetu.com/*/*",
        "*://kakuyomu.jp/*/*",
        "*://www.alphapolis.co.jp/*/*",
        "*://estar.jp/*/*",
        "*://novel.daysneo.com/*/*",
        "*://syosetu.org/*/*",
        "*://novelup.plus/*/*",
        "*://www.aozora.gr.jp/*/*"
      ],
      "css": [
        "controller.css"
      ],
      "js": [
        "speaker/Speaker.js",
        "speaker/SystemSpeaker.js",
        "speaker/BouyomiChanSpeaker.js",
        "speaker/VoiceVoxSpeaker.js",
        "parser/Parser.js",
        "parser/NarouParser.js",
        "parser/KakuyomuParser.js",
        "parser/AlphapolisParser.js",
        "parser/EverystaParser.js",
        "parser/NovelDaysParser.js",
        "parser/HamelnParser.js",
        "parser/NovelUpPlusParser.js",
        "parser/AozoraParser.js",
        "data-access.js",
        "engine.js",
        "keycodes.js",
        "main.js"
      ]
    }
  ],
  "homepage_url": "http://syosetu-yomiasari.com",
  "options_ui": {
    "page": "settings.html",
    "open_in_tab": true
  },
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "ruleset",
        "enabled": true,
        "path": "rules.json"
      }
    ]
  },
  "permissions": [
    "declarativeNetRequest",
    "tabs",
    "storage",
    "*://ncode.syosetu.com/*/*",
    "*://novel18.syosetu.com/*/*",
    "*://kakuyomu.jp/*/*",
    "*://www.alphapolis.co.jp/*/*",
    "*://estar.jp/*/*",
    "*://novel.daysneo.com/*/*",
    "*://syosetu.org/*/*",
    "*://novelup.plus/*/*",
    "*://www.aozora.gr.jp/*/*",
    "*://syosetu-yomiasari.com/*",
    "*://localhost/*"
  ],
  "host_permissions": [
    "*://syosetu-yomiasari.com/*",
    "*://localhost/*"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "*"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ]
}