Changing Middle Mouse Button Function for Citrix Session and Local Firefox Browser


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
  • System > Registry > sessions.ica%.appsrv.mousesendscontrolv

For local Firefox browser change:

  • System > Registry >
  • System > Registry >

More information on the Firefox parameters can be found at

The changes will take effect after rebooting the thin client.

Last update: May 13, 2019