To complement:

Since as early as October 2020 on testing [1] and as early as January 2021 on stable [2].

[1] https://techcommunity.microsoft.com/t5/articles/vertical-tab...

[2] https://docs.microsoft.com/en-us/deployedge/microsoft-edge-r...

I can't use Edge for one stupid simple reason: Ctrl+Tab can not be made to cycle tabs in most recent use order, only in the order tabs are displayed. It is especially weird considering Alt-Tab in Windows does most recent.

I switched from Vivaldi to Edge because unfortunately Vivaldi become unusably slow for me beyond a certain amount of open tabs (hopefully just a bug they'll fix eventually).

I miss the little search bar for tabs that Vivaldi shows in the vertical tabs view.