You asked, we built it: Firefox tab groups are here  | The Mozilla Blog
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What happens when 4,500 people ask for the same feature? At Firefox, we build it. Tab groups have long been the most requested idea on Mozilla Connect –
  • Robust Mirror@aussie.zone
    0·
    9 days ago

    Do you have “open previous windows and tabs” ticked in settings? I’m also on 64bit win10 without the issue you describe.