It's just doing the same stuff Opera did (with a much less pleasing engine).

I've used Vivaldi for years but now I'm getting split on it. I've got regressions that are just unacceptable (especially when it comes to video playback), but at the same time it comes with features I can't live without.

Zawinski's Law of Software Envelopment : “Every program attempts to expand until it can read mail. Those programs which cannot so expand are replaced by ones which can.”

Google/Chrome has gmail. Vivaldi has a mail client. That's why Firefox is dying!

I mean, there are different setups of Vivaldi you can choose when you first open the browser: https://vivaldi.com/features/#essentials

Essentials gives you the very basic stuff, classic gives you some extra features, and fully loaded gives you the built in mail client and all that other stuff.