Examine source code of BrowSync

{
  "manifest_version": 3,
  "name": "__MSG_extName__",
  "version": "1.1.14.1",
  "description": "__MSG_extDescription__",
  "default_locale": "en",
  "background": {
    "scripts": [
      "background/service-worker.js"
    ],
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@browsync.app",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; connect-src 'self' ws://127.0.0.1:62333"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/content-script.js"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "permissions": [
    "bookmarks",
    "tabs",
    "cookies",
    "storage",
    "scripting",
    "alarms",
    "unlimitedStorage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "icons": {
    "16": "icons/ext-icon16.png",
    "48": "icons/ext-icon48.png",
    "128": "icons/ext-icon128.png"
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "__MSG_extName__",
    "default_icon": {
      "16": "icons/ext-icon16.png",
      "48": "icons/ext-icon48.png",
      "128": "icons/ext-icon128.png"
    }
  }
}