Hi. Just wanted to add my two cents.
I definitely like vertical tabs. Easier to maintain your tabs / tab groups and more space for the site and the tab description is nice. No going back like someone in the other post mentioned.
When I have tabs minimised It would be great if I could use my keyboard to trigger the overlay and to go through tabs with arrows. Enter to go to the selected tab. Or an option to configure shortcuts.
It is also really annoying to hit the x button. Could be bigger. Or if keyboard navigation would be possible then there is already a shortcut to close the tab.
Thanks for hearing!