Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

• Don't make any changes on the Safe mode start window.
• https://support.mozilla.com/kb/Safe+Mode

• https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

Thank you for the reply. I have a little more information.

The first window I open appears to work correctly. I can open multiple tabs and everything appears to be fine. (The tabs are above the address bar)

When I open a second (or third, etc...) window, I have the problem stated originally. (The tabs are below the address bar in these windows)

Running in "Safe Mode" does appear to correct this problem.

I'm assuming the next step is to disable the add-ons until I narrow it down to which one is causing the problem.

Yes that's true. Proceed with the procedure mentioned in the last link provided by Cor-el

Two different extensions are causing the problem:

• Firebug 1.8.1
• Zone Alarm Community Toolbar 3.6.0.10

Neither have updates available, or options to set/unset to troubleshoot any further.

I'll just leave them disabled for now.

Let me know if you need anything further from me.

Thank you,

Kenny

lol we don't need anything from you ;-P

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I wasn't sure if you have a way to report the problem back to the author of the extension so the make corrections, and might need more iformation :-)

Kenny