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Re:Double-decker browser tabs can be yours with Vivaldi by alecmg on Thursday January 28, 2021 @04:16AM (#25939870)
So still catching up to original Opera browser?

Where is the M3 mail client!?

Re:Double-decker browser tabs can be yours with Vivaldi by jonmccull on Thursday January 28, 2021 @04:46AM (#25940027)
Mail, Calendar and RSS are available in the Snapshot version under vivaldi://experiments/

More on the Technical Preview here: https://vivaldi.com/blog/vivaldi-mail-technical-preview/