Examine source code of Sharing Clipboard

{
  "manifest_version": 3,
  "name": "Sharing Clipboard",
  "version": "1.0",
  "description": "Share clipboard and files privately with paired browser.",
  "background": {
    "page": "background.html"
  },
  "permissions": [
    "privacy",
    "clipboardWrite",
    "clipboardRead",
    "storage"
  ],
  "commands": {
    "toggle-sharing": {
      "suggested_key": {
        "default": "Ctrl+Alt+S",
        "mac": "MacCtrl+Alt+S"
      },
      "description": "Toggle sharing clipboard"
    },
    "copy-remote-clipboard": {
      "suggested_key": {
        "default": "Ctrl+Alt+C"
      },
      "description": "Paste remote clipboard"
    },
    "paste-remote-clipboard": {
      "suggested_key": {
        "default": "Ctrl+Alt+V"
      },
      "description": "Paste remote clipboard"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "sharingclipboard@addons.mozilla.org",
      "strict_min_version": "109.0"
    }
  },
  "action": {
    "default_popup": "pages/popup.html",
    "default_icon": {
      "16": "pages/images/icon16.png",
      "48": "pages/images/icon48.png",
      "128": "pages/images/icon128.png"
    }
  },
  "icons": {
    "16": "pages/images/icon16.png",
    "48": "pages/images/icon48.png",
    "128": "pages/images/icon128.png"
  }
}