Middle mouse button cannot be used for smooth scrolling within applications like Excel or Internet Explorer within a Citrix session or with the local Firefox browser.

The default function of the middle mouse button is copy and paste.

Open IGEL registry in local client setup or UMS.

Middle Mouse Button

For Citrix sessions change:

  • System > Registry > ica.wfclient.mousesendscontrolv

For local Firefox browser change:

  • System > Registry > browserglobal.app.middlemouse_contentloadurl
  • System > Registry > browserglobal.app.middlemouse_paste

More information on the Firefox parameters can be found at



The changes will take effect after rebooting the thin client.