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links opening new tabs and new windows

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When I click on open all in new tabs command in settings, the links open in new tabs but have also started opening in separate new windows as well . If I delete/close a tab, the corresponding window will close. If I close a window, the corresponding tab closes. If I close the tabbed window, all of the otehr new windows close, but if I try to reopen Firefox I get the Firefox is still running message. Once I click on close, I can reopen Firefox. I am running on Windows 10 (fully updated) on a laptop PC. This has only just started. I have the open links in new tabs setting enabled????????

When I click on open all in new tabs command in settings, the links open in new tabs but have also started opening in separate new windows as well . If I delete/close a tab, the corresponding window will close. If I close a window, the corresponding tab closes. If I close the tabbed window, all of the otehr new windows close, but if I try to reopen Firefox I get the Firefox is still running message. Once I click on close, I can reopen Firefox. I am running on Windows 10 (fully updated) on a laptop PC. This has only just started. I have the open links in new tabs setting enabled????????

Alla svar (3)

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Did you check your settings to see if something wasn't changed?

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about:preferences > tabs

make sure you check open new windows in a new tab instead

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It seems that the individuals windows were actually displaying in the taskbar and disappeared when I unchecked the display windows in taskbar option (not sure how it got checked in the first place though)............