Simple and effective. I didn't like the tree style of the tree tab addon, so I went with this one.

I like the addon and I can't live without it. But I have to because switching tabs or even clicking on a link (especially on twitter) very often doesn't work properly. So I uninstalled it.
BTW: I'd like option to switch between left and top title bar, not left or nothing.

Alternative to tree-stye tab for those who don't need all features of tree-style tab. Simple, space-efficient, good looking with some themes. But, doesn't show sound icon on tabs with playing music.

great extension, better than official tab center, but when I hide title bar the min-max-close buttons overlay with menu button, can we move those button in toolbar?

This extension is very essential to Firefox, but now I don't have any title bar window, and the "toggle" is broken, if I disable the extension then the title bar appears correctly

I love this simple extension, as it allows me to put my tabs on the left.

I wanted tabs on the left with no fuss. This add-on did just that with a few simple options.

Nice, but...
I like when Tabbar on right and bookmark bar on the left.
Tree Style Tab can this, but have many not needed options.
This add-on cant make a bars on different sides.

It will be good if when we push on Ctrl or Alt, we can see the tree and when we release the key, tree disapears. :)

Basically, I just want my tabs on the side. This addon fit the bill. No extra "et cetera" or any "et cetera". Not interfere with other Firefox built in features. Customize able shortcut for hide/unhide is a plus 1, never like auto hide.

fyi
Unfortunately it kills addons.mozilla.org/en-GB/firefox/addon/vertical-toolbar
I suppose that is not unexpected. (Can be recovered with settings by removing both & re-installing vertical-toolbar.)

In the brief time I tried vertical tabs reload (I had used it before), I was disappointed there is no auto-hide - although the pull-out is almost as good.
It confused me that I couldn't find the tab-close x with a small width, but perhaps that was my fault.

Thank you to the developer! Not bad at all, but it could use two features that it is missing. First, like the one in TabKit 2, it needs a "Search" function to limit the display of tabs to those containing the entered text. I keep a lot of tabs open, and that would make it easier to locate, for example, my bank cards and other account logins and my VA medical center login when I need them, or particular YouTube videos. Secondly, again like TabKit 2, would be an option to right-click in the sidebar to access its configuration options.

These are not showstoppers, but it's why four stars instead of five. I would be more than happy to donate if these, or even just the Search feature, were implemented. Thanks again!

Great Add-on! And I love the theme options. Shame it can't hide the title bar in windows 10, it's such a waste of space.

FYI, for those curious, it doesn't work yet with Multiprocess/e10s; even setting FF to force e10s doesn't work.

I'm really looking forward to being able to use multiprocess/e10s and a vertical tab add-on at the same time!

Thank you for good addon. It's very helpful.

Very nice vertical tabs. I like it!

thanks for your work buddy!

I have been trying and trying... finally I found one that works right away. Simple and does what I want it to.

When used with AIO sidebar an essential addon for me you can't choose to have tabs on right and sidebar on left or vice versa. No matter what setting they are both on the SAME side.

Been a couple of years at least since I got off vertical tabs. Revisiting the concept, there is now this new addon. This is the best Vertical Tab addon ever! Up until now no one has been able to do it right. Only very minor quibble is pinned tabs have text labels.

A fully functional vertical tabs extension. What's more, it's got some decent themes, and it can hide during fullscreen.

Must-have extension. Thanks!

After trying several vertical tabs options, this one seems to works best. It even supports GTK-theme on Linux :-)

Looks good, works with ColorfulTabs, Tab Mix Plus, and SessionSaver. It also hides during fullscreen videos.

But it doesn't work with Multiple Tab Handler... :/

This is the best vertical tab extension that is undergoing active development and it properly hides the tabs in full screen mode. I frequently have close to 30 tabs open at a time and vertical tabs are essential in order to keep tab titles visible during my workflow. This the kind of extension that should be built into Firefox by default.

I hope that future updates will also allow users to modify theme colors to their liking. (For instance, I prefer the overall styling of the Darwin theme but I like the colors of the Dark theme much more.)