Sometimes when I click on a tab, instead of simply switch to this tab, a new Firefox window opens, which can be very annoying. How can I stop this?

I have several tabs open. I want to look at one of them and I click on it. Instead of simply switch to this tab, Firefox opens a new window. Very annoying! Why does do this and, more importantly, how to make it stop?

I use Firefox on Ubuntu LTS 14.04 36.0.1.

The current versions of Firefox have a feature called tabs.
You can detach a tab in the current window and open in a new window by dragging a tab in the browser window.
You can also do this via the context menu of a tab: switch to the new window
You can drag the tab to the tab bar in the original window to cancel this detachment.

See also:
bug489729 (Disable detach and tear off tab):

Tags: Firefox

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