Examine source code of SimpleTextReader

{
  "manifest_version": 2,
  "name": "易笺",
  "description": "txt（小说）阅读器：支持秒开本地的所有txt文件，自动排版，自动分页，自动生成目录，记录阅读进度。",
  "version": "1.6.9.4",
  "background": {
    "scripts": [
      "client/app/extension/activate.js"
    ],
    "type": "module"
  },
  "browser_action": {
    "default_icon": "client/images/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "file://*/*.txt*"
      ],
      "js": [
        "client/app/extension/contentScript.js"
      ],
      "all_frames": true,
      "run_at": "document_start"
    }
  ],
  "content_security_policy": "script-src 'self' 'wasm-unsafe-eval'; object-src 'self'; font-src 'self' https://fontsapi.zeoseven.com blob:",
  "icons": {
    "24": "client/images/icon24.png",
    "64": "client/images/icon64.png",
    "128": "client/images/icon128.png"
  },
  "homepage_url": "https://github.com/henryxrl/SimpleTextReader",
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{30e73a28-dd0a-41e1-926d-d1c56b0744ff}"
    }
  }
}