The "+" tab has disappeared.
I recently installed Firefox 4. It seem great. Initially it was fine, but the "+" tab to add a new tab disappeared at the end of the open tabs row has disappeared. I still have the shortcut at the top of the page, and, if i double click in the blank space next to the last tab in the row, a new tab then will open. Strange!
Wšykne wótegrona (1)
You can customize the toolbars and add the "Plus" tab back to your tab bar. For instructions, see Customize Firefox controls, buttons and toolbars