Seems to work in zen browser which is firefox based. I make a whole bunch of tabs, randomly re-arrange them and when I start closing them at random it's always going to the left.

Works. With vertical tabs it focus the tab above.

Tut was es tun soll. OHNE unnötige Berechtigungen zu verlagen. Extrem gut.

Yes

just started using it , works fine need more of these hard to find.

Works for me with Firefox, 89.0.2 (July, 2021)

Thanks!

Works great and does exactly what it says it does.

Really natural and smooth tab transitions, no other addon can be like this.

Now is OK.

Great extension! Work perfect