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Vivaldi's tab tilling add-on in Firefox
(lemmy.dbzer0.com)
A place to discuss the news and latest developments on the open-source browser Firefox
I switched from Vivaldi to Librewolf a while back and I found Panorama Tab Groups and I think it is superior. YMMV
I don't think that's the same thing.
Tab tiling means having two or more tabs open at once, so that both can be worked on at the same time.