Examine source code of Vietnamese Typing

{
  "manifest_version": 3,
  "name": "Vietnamese Typing Extension",
  "version": "1.0.1",
  "description": "Enables Vietnamese typing using VietUni library. Toggle with double Ctrl key press.",
  "action": {
    "default_icon": "icons/icon16.png",
    "default_title": "Options for Typing Method",
    "default_popup": "popup.html"
  },
  "host_permissions": [
    "<all_urls>"
  ],
  "permissions": [
    "activeTab",
    "storage"
  ],
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "599c4464-8a1a-4134-90c5-a4a5abbd3977@vietnamese-typing-chrome.firefox",
      "strict_min_version": "109.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "scripts/vietuni.min.js",
        "scripts/content.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}