Almost works with Firefox 46 64 bits in Win7 Rated 4 out of 5 stars

Almost: new created tabs don't show nor one of the pinned, so almost but really good already :)

This user has 2 previous reviews of this add-on.

Awesome add-on Rated 5 out of 5 stars

I'm using this addon for years now and it is for me the best I ever found. Easy to use, intuitive, and without bugs. A great tool to structure tabs.
thank you Piro for your great work !!

The best, but with bugs Rated 4 out of 5 stars

Every so often the pinned tabs get all messed up, with pinned tabs partially showing. Even restarting does not fix it. Would be great to see this issue fixed. Possibly a conflict with Tile Tabs?

SpeedDial Rated 5 out of 5 stars

After 0.16.2015122501 opening websites in background doesn't work in SpeedDial add-on

Tree Style Tab - The Best Rated 5 out of 5 stars

This is the best vertical tab menu system, I've used. I've been using it for a long time and it really makes Firefox usable. Please keep up the good work, keeping it simple, clean, and functional. Thank you!

tree style tab & session manager are best addone Rated 5 out of 5 stars

tree style tab & session manager are best addone

Excellent Rated 5 out of 5 stars

Works great. Though I wish you could put toolbar buttons on the same row as pinned tabs.

Bug: If you remove the "List all tabs" button from the tab bar, the tab bar stops being displayed (wherever you've put it) you have to disable the add-on in order to put the button back and then re-enable it.
A few minor conflicts with other add-ons:
Double Click Add New Tab adds a tab at the very end of the tab bar instead of next to the current tab like it does without this add-on.
UnloadTab fails to show unloaded tabs as greyed out sometimes.

This user has a previous review of this add-on.

Classic Opera conflict? Rated 5 out of 5 stars

If you do not work this (
do not open tabs in tree style and by CTRL+Click), check whether the installed plug-in called "Classic Opera" and unplug it.

Favorite Add-On EVER! Rated 5 out of 5 stars

I just wanted to leave a little review due to the fact that Tree Style Tab is BY FAR my favorite and most used add-on. I give it a 5 Star rating, HOWEVER, it does still have a few bugs to work out. It can be a little fidgety when it comes to different screens (ie. When you go to the customization window in Firefox the vertical tab bar goes back to being on the top of the browser, which can be a little frustrating when trying to make things look visually appealing to the user... But it goes back to being vertical as soon as you exit the customization screen so not THAT big an issue.)

Despite that, and a few more small glitches with Tree Style Tabs... I still give this add-on 5 stars due to the idea, implementation, and ya know... it just works.

Chrome DOES NOT have an add-on anywhere close to this one. All of the tab handlers on chrome suck and make you have to use a whole new tab page or tab or screen... I dunno... they just do it very sloppy and inefficient in chrome. I put that in this review because it could TOTALLY make your decision on which one to use. Tree Style Tabs is actually my main reason I enjoy Firefox so much and do choose it over Chrome myself.

If there is one thing that I would LOVE to see you goes add into this add-on is more visual styles to choose from. Please add a few more? It's been a while and I look for new ones every update and still have none. THANKS AGAIN FOR A GREAT APP from a long long time fan!
-Manny C. [Ple4seStandby]

saves time Rated 5 out of 5 stars

I'm using it for a few months now
it really helps a lot to keep your tabs organized
especially if you have over 20 tabs open (constantly)

One bug I found:
you can only set the width to fixed with the context menu
if you do it in the settings dialog, then the slider to change the width will still be there

Great vertical tabbar, hides during fullscreen, & compatible with other tab extensions Rated 5 out of 5 stars

Great! This is one of the few vertical tabs add-ons that works flawlessly out of the box, including hiding during fullscreen videos, and fully compatible with all other extensions I'm using: Multiple Tab Handler, ColorfulTabs, Tab Mix Plus, Tab Kit Mouse Gestures, & Classic Theme Restorer (enable "squared tabs" option for compatibility with ColorfulTabs).

Great idea! I hope it's fast and steady! Rated 5 out of 5 stars

Great option! I hope it'll be by default in Firefox

New group disappears? Rated 3 out of 5 stars

I've recently installed this add-on in conjunction with Multi Tab Handler, as recommended.

It's working well for me with new tabs, for example: Selected google search results get grouped hierarchically in a natural, useful way.

But when I highlight several tabs and choose "new group" in the context menu, the tabs, and the new group, disappear.

I'd be very glad of some tips or troubleshooting!

Have tentatively switched to Tab Groups Helper (https://addons.mozilla.org/en-US/firefox/addon/tab-groups-helper/?src=api), so far so good.

Generally good Rated 4 out of 5 stars

It's the only option that works consistently. Would be much better if the option to disable tree collapsing weren't removed (Seriously, why? Collapsed trees are annoying).

Beautiful Add-On Rated 5 out of 5 stars

Great add-on. I don't know how I managed to live that long without it. Invaluable for all those that follow different tracks and leads while surfing and want to have those tracks nicely organised.
Great customisation options too (especially the many auto-hide and -display options).
Thanks for this nice tool!

Essential Rated 5 out of 5 stars

I will not browse without this extension. This is the way tabbed-browsing was meant to be, especially these days with wide-screen monitors. Keeps everything organized, collapse and expand trees, know where you are and how you got there... There is no going back. People surfing the internet without Tree Style Tab are not surfing, they are stumbling.

Excellent for wide screens, lots of configuration options Rated 5 out of 5 stars

Works as described. Has plenty of configuration options.

I loved it! Rated 5 out of 5 stars

It's really usefull and make the work much more easy

The most important Firefox feature Rated 5 out of 5 stars

This addon is the only reason I use Firefox. I even don't mind huge memory consumption as long as I can have all my tabs visible and easy to navigate. It's better than favorites - you don't need to take any additional steps to save a page for the future self.

good stuff Rated 4 out of 5 stars

It is really good addon. The only thing that I miss is the old tab view in the top, and the left side tree view simultan. The top tabs are really messed up when you start the parent-children grouping, but I think that is much more useable then the tabless header version.