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Mozilla released a Firefox Nightly test build with vertical tabs - gHacks Tech News
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I was just today trying FF again and discovered vertical tabs was via extension only and holy shit disabling the tabs up top looked like a bit of work. Native vertical tabs and grouping and I'm back. It should just copy the layout that Edge does.
Thank you
I can second that I need to F1 regularly in Fx to fore that sidebar to rerender. I’ll get weird bugs with the pinned tab row.