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.
Menu Path: Configuration > System > Registry
The default function of the middle mouse button is copy and paste.
->Open IGEL Registry in local client setup or UMS.
->For Citrix sessions change:
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System > Registry > ica.wfclient.mousesendscontrolv
->For local Firefox browser change:
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System > Registry > browserglobal.app.middlemouse_contentloadurl
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System > Registry > browserglobal.app.middlemouse_paste
The changes will take effect after rebooting the thin client.
More information on the Firefox parameters can be found at