For me, this issue only affect Nav for i, and nothing seems to fix it. It takes me 7 full scrolls of my mouse wheel to move 1 single line.
From: Steinmetz, Paul [mailto:PSteinmetz@xxxxxxxxxx]
Sent: Thursday, May 22, 2014 2:57 PM
To: 'Midrange Systems Technical Discussion'
Subject: RE: Navigator for i vrs. System i Navigator
Sometimes my FF goes into "turtle mode", 5 sec delay between keystrokes.
Closing FF and/or PC reboot always resolves the issue.