Examine source code of Textarea Cache

{
  "browser_specific_settings": {
    "gecko": {
      "id": "textarea-cache-lite@wildsky.cc",
      "strict_min_version": "109.0"
    },
    "chromium_background": {
      "service_worker": "service-worker.js",
      "type": "module"
    }
  },
  "manifest_version": 3,
  "name": "Textarea Cache",
  "version": "5.0.7",
  "default_locale": "en",
  "description": "Allows to save automatically the content in a text input field.",
  "homepage_url": "https://github.com/wildskyf/TextareaCache",
  "icons": {
    "48": "icons/icon.png"
  },
  "permissions": [
    "storage",
    "clipboardWrite",
    "menus",
    "tabs",
    "activeTab"
  ],
  "action": {
    "default_title": "View your saved data (Textarea Cache)",
    "default_icon": "icons/tacache-48.png"
  },
  "content_scripts": [
    {
      "match_about_blank": true,
      "all_frames": true,
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle",
      "js": [
        "browser-polyfill.min.js",
        "helper.js",
        "content-script.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "browser-polyfill.min.js",
      "common.js",
      "ta_database.js",
      "ta_bg.js",
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html"
  }
}