The latest version no longer allows me to simply cycle through my tabs. Instead, a very limited switcher appears. Very, very annoying. And switching back to the previous tab with shift+tab now opens a menu of tabs instead. That's a deal-breaker. I'm removing this annoyance, and looking for a solution that isn't trying to be so 'cool', or trying to be too much more than just a way of listing my tabs on the right. Why did you do this to me?

Works very well. Not sure if it is possible, but it would be nice if windows with only one tab hid the sidebar by default.
update: does not work in Android on my Cosmo Communicator. nothing is visible.

Ookoo...

For every one looking for a solution to hide the horizontal tabs, tested and approved : https://www.hackerway.ch/2017/11/17/firefox-57-quantum-and-vertical-tabs/

I was using Tab Kit 2nd Edition and very much liked it. With Version 52.0 it went obsolete, so I'm using this now, This is pretty nice, but a couple of things I'd like to see:

1. Resolution to hiding the horizontal tab bar.

2. A true autohide of the vertical tab bar that does not require Ctrl-Shift-V.

This is very nice anyway. Would be great to see these things as well.

Fellow dev here. Nice work - this is great.

Great addition. One of the enhancements you can make to your browsers that makes you go "Why wasn't it always like this?".

One significant improvement would be to allow users to reverse order the list. I open a lot of tabs and tended to work from right back to left. In vertical tabs, this means I am working from bottom to top and I would much prefer to work from top to bottom. Please consider allowing users to reverse the order of the list!

Apart from that, works great 5*

Really clean & useful tab's plugin. Just one litle issue, we cant use it to disable main tab's bar. I know you can't do it with a plugin since firefox 57 but it's sad ;(

after loosing Tab Mix Plus i checked this. its good+works. for me the theme fonts are too small@the moment. and i like tree tabs option to save sessions (should be autosave as well)