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You asked, we built it: Firefox tab groups are here | The Mozilla Blog
(blog.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
Tab groups are built for open tabs, bookmarks are built for revisiting things. Their use cases are quite different in my opinion.
This question is a highly personal one from my perspective. I haven't used the groups yet but I often toggle between six or seven contexts throughout the day and I'll give them a shot for that.
Profiles toggling just didn't work for me as it was too ... Slow for me as in I have to reorientate myself whenever I switched profiles.