I'm not quite sure if I understand you. When you say "Tabs on top have been turned off", do you mean you've moved them to below the location bar, or do you mean you've disabled the Tab bar altogether?

I think you're asking if I've moved them below the location bar, ala pre Firefox 4.

I've turned off (disabled tabs on top) in this manner

By Default "Tabs on Top" is enabled. This can be disabled by

• -Firefox Menu
• -Options
• -Clicking "Tabs on Top"

That doesn't disable them, but merely moves them to below the location bar.

If you want to disable them, go to Options | Options | Tabs and remove the checkmark from: "Always show the tab bar".

Hovering the mouse near the top of the screen reveals the toolbars, not just tabs.

If it's not working for you, try running Firefox in Diagnose Firefox issues using Troubleshoot Mode. If it functions properly in that configuration, then one of your add-ons is the culprit.

Thanks, safe mode isolated the problem.

The problem appears to be the add on "ColorfulTabs 4.8.1.6.2.1". I've passed a note onto the developer.

You're welcome.

Could you please click the "Solved It" button next to the post which solved the problem for you? This will help others searching for a solution to the same question.

Thanks.