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Multiple tabs closing when trying to close one tab.

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Firefox closes multiple tabs when I'm closing only one (using x on tab). It doesn't happen every time. But it seems like it happens when I am working on something. I will open a new tab to research something I am working on. Sometimes I open one tab, sometimes three or more. Once I find my answer I will close the unneeded tab(s) and it will also close the main tab I'm working with even though I didn't click the x on that one. When closing old tabs to left this never happens. Only the tabs to the left of what I'm working on. I'm afraid to close tabs now. I tried it in safe mode and was still able to recreate the problem. I also made sure that the browser is up do date. It is. I'm on a Lenovo ThinkPad with Windows 10 Pro 20H2. Processor Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz 2.90 GHz Installed RAM 8.00 GB (7.60 GB usable) System type 64-bit operating system, x64-based processor Drive SanDisk SSD PLUS 240GB SATA III 6G/s 2.5" 7mm

Ideas? Thanks!

Firefox closes multiple tabs when I'm closing only one (using x on tab). It doesn't happen every time. But it seems like it happens when I am working on something. I will open a new tab to research something I am working on. Sometimes I open one tab, sometimes three or more. Once I find my answer I will close the unneeded tab(s) and it will also close the main tab I'm working with even though I didn't click the x on that one. When closing old tabs to left this never happens. Only the tabs to the left of what I'm working on. I'm afraid to close tabs now. I tried it in safe mode and was still able to recreate the problem. I also made sure that the browser is up do date. It is. I'm on a Lenovo ThinkPad with Windows 10 Pro 20H2. Processor Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz 2.90 GHz Installed RAM 8.00 GB (7.60 GB usable) System type 64-bit operating system, x64-based processor Drive SanDisk SSD PLUS 240GB SATA III 6G/s 2.5" 7mm Ideas? Thanks!