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On firefox 23.0.1, there are arrows left and right of the tabs bar, as firefox hides some tabs if you have "too many" opened.

I really dislike this behavior, as sometimes tabs opened recently, at the right end, will be literally hidden from view, requiring one more click to show it.

I've found some discutions online about tab behavior, even a setting to change in about:config, but nothing works at the moment.

annoying arrow for tabs in firefox 23

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up vote 3 down vote accepted

Install the addon Prevent Tab Overflow:

This simple yet powerful addon allows your tabs to shrink to a smaller size before going into overflow.

enter image description here

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Extension from magicandre1981's answer lets you to set minimum width only to 40, Custom Tab Width lets you to set minimum width to 20

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