Examine source code of Sound Hints

{
  "manifest_version": 3,
  "name": "Sound Hints",
  "version": "2.8",
  "default_locale": "en",
  "description": "__MSG_popupDescTitle__",
  "icons": {
    "16": "pluspell16.png",
    "128": "pluspell128.png"
  },
  "permissions": [
    "storage"
  ],
  "background": {
    "scripts": [
      "plu-extension/pluService.mjs"
    ],
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{01b71979-258b-43c6-8250-b55294cd3ba7}"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "css": [
        "plu-base/PluContent.css"
      ],
      "js": [
        "plu-extension/pluContentMain.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "matches": [
        "<all_urls>"
      ],
      "resources": [
        "plu-base/Logger.mjs",
        "plu-base/Ekey.mjs",
        "plu-base/PluToken.mjs",
        "plu-base/PluDom.mjs",
        "plu-extension/pluMessage.mjs",
        "plu-extension/pluContent.mjs"
      ]
    }
  ],
  "options_ui": {
    "page": "plu-extension/pluExtension.html",
    "open_in_tab": true
  },
  "action": {
    "default_icon": {
      "16": "pluspell16.png"
    },
    "default_title": "Sound Hints",
    "default_popup": "plu-extension/pluExtension.html"
  }
}