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Tabs keep turning into new windows

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I keep many tabs open both on this work computer and my home computer. This morning, at work, when I go into a tab, Firefox pops the tab out and turns it into a new window (and removes the tab from my regular viewing screen). This is quite frustrating. i don't have nearly as many tabs here as I have at home (where this has never happened) but I rely on tabs to keep things organized and streamlined. No particular rhyme or reason for this. It isn't happening every time or to every tab. But it keeps happening randomly.

I keep many tabs open both on this work computer and my home computer. This morning, at work, when I go into a tab, Firefox pops the tab out and turns it into a new window (and removes the tab from my regular viewing screen). This is quite frustrating. i don't have nearly as many tabs here as I have at home (where this has never happened) but I rely on tabs to keep things organized and streamlined. No particular rhyme or reason for this. It isn't happening every time or to every tab. But it keeps happening randomly.

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Make sure that you do not drag a tab down in the browser window.

Firefox 3.5 versions and later have a feature called tear-off tabs.
You can detach a tab from the current window and open it in a new window by dragging a tab in the browser window.
You can drag that tab back to the tab bar in the original window to undo that detaching.