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When I have more then one tab, the second or third tab will suddenly close and reopen as a new window., how do I fix this? Happens at random times.

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I will start with one window and three tabs and end up with three windows with one tab in each.

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More Information

cor-el
  • Top 10 Contributor
  • Moderator
10761 solutions 96861 answers

Current Firefox versions 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.

bug489729 (Disable detach and tear off tab):