User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.3) Gecko/20030312 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.3) Gecko/20030312 When you have the 'Site Navigation Bar' displaying and you 'shrink' by clicking the bar's knob, and you hover over the resulting knob, it displays a null tooltip. Reproducible: Always Steps to Reproduce: 1. Click View > Show/Hide > Site Navigation Bar > Show Always 2. Click the Site Navigation Bar's hide knob. 3. Hover over the Site Navigation Bar's knob which shows it is hidden. Actual Results: A tooltip with no text inside it appeared Expected Results: A tooltip with 'Site Navigation Bar' inside it should appear I am using the Breeze theme, but the problem also occurs in the default theme.

see this myself Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4b cdn) Gecko/20030511 [ my cvs build from yesterday ] no tooltip for grippy when link toolbar visible, empty tooltip when collapsed I expect this is related to the default tooltips bug : bug 102972

Reports of this same problem are duped to bug 102972. I can't see how this one is any different. *** This bug has been marked as a duplicate of 102972 ***