It is the Best sidebar I've ever used. The freedom to customize nearly every aspect is superb, and the default configuration is already super lovely and usable.

Takes some tinkering and getting used to, but helped my quitting my addiction to Arc Browser. Should inform users that you must take snapshots if you want to keep your tabs

Thanks for performance improvements with a lot of tabs in 5.0

i come from treestyletab, and this extension is amazing

I haven't been able to live without vertical tabs in years. This is the best Firefox implementation of it I have found yet.

Just got a big update that improves a bunch of stuff that was already good.

I just discovered that clicking on the tab you're already on switches to the previous one you visited, so repeatedly clicking the same tab switches between the two every click. I have no idea what I'm going to use this feature for, but it feels well designed and I love it.