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Is this an add-on or do we have to edit the style sheet by ourselves?

some tabs are grouped (top left)

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migrated from Dec 11 '13 at 23:21

This question came from our site for power users of web applications.

up vote 1 down vote accepted

This is a feature in Firefox called Pinned Tabs. To make a pinned tab, just:

Right-click on the tab you want to pin and select Pin Tab from the menu.

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