Firefox tabs combining

When I use Firefox I tend to open a lot of tabs. But when I go to close tabs they all go, except when I get down to three tabs and close the third tab, the remaining two tabs combine together so that only one of them is visible. To see the other tab I have to open another third tab. It is as though Firefox can display 1, 3 or more tabs but not 2. Anyone know why or how I stop it doing this?
''I have included the troubleshooting information although I have this problem on another computer running Firefox with different extensions installed''

Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See:
* [[Troubleshooting extensions and themes]]
* [[Troubleshooting plugins]]
If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
* Use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
* Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

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Can you attach a screenshot?
*http://en.wikipedia.org/wiki/Screenshot
Use a compressed image type like PNG or JPG to save the screenshot and make sure that you do not exceed the maximum file size (1 MB).

Firefox tabs combining

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