Update : there is a companion extension that supports scrolling among the tabs using the wheel of the mouse: https://addons.mozilla.org/en-US/firefox/addon/tree-style-tab-mouse-wheel/
Therefore the Autohotkey solution is now obsolete.
------------------------- old review -----------------------------
One more 5 Stars and a bigup for Piro!

I really like to be able to scroll the tabs in my Firefox. Since v57, it's not possible anymore, so here is a solution found on the"Tab Wheel Scroll" extension page :

1) Get Autohotkey
2) Create the following script:


#IfWinActive ahk_class MozillaWindowClass
;MouseGetPos, [OutputVarX, OutputVarY, OutputVarWin, OutputVarControl, 1|2|3]
~WheelDown::
MouseGetPos X, Y
if ( X < 205 )
SendInput ^{PgDn}
Return
~WheelUp::
MouseGetPos X, Y
if ( X < 205 )
SendInput ^{PgUp}
Return

And run the script whenever you launch Firefox.
You must adjust the X value ("205" pixels in my case) to the width of your vertical tab.

Great extension that allow me to easily manage 100+ tab

the main reason I Insist on using firefox.おつかれさまです

Very good and Tab Search will make it better.

This extension is great for me who keep open many tabs and it helps me keep being productive by organizing hierarchically my browsing, I cannot do without anymore, no equivalent for chrome. The new version integrate well in the new Firefox (57), but it's less useful with the top bar staying still and the title. I solved it with userChrome.css, but it's would be easier with an option for the non-technical user. Great work and thanks a lot !

It's working well.

Very good and useful.

Anonymous user 097179 ty for great explanation!!! Now all works right for this great extension!

Been using this addon for years now, and tried a few alternatives, but nothing ever came close.
The developer Piroor is also very active on his GitHub.

Not Piro's fault for the top tabs, that is Firefox's new API limitation and Piro has gone to great lengths to get it this far. Just a simple couple of steps to get rid of the top tool bar if you read the bubble information in the new update or just look for the links in these reviews.

Still an indispensable addon for Firefox. I like the new version and thrilled it made it over to the new version 57. I wouldn't use Firefox without it to be quite honest.

Thank you Piro, been using your addons for years. My workflow would not be the same without them.

For those that can't be bothered to educate themselves, here's a copy/paste from someone that took the time to write out step by step instructions. Takes less than 2 minutes to do.

If you're like me and primarily used this add-on to remove the tabs from the top, follow these instructions provided by user Soulyaris:

"Inside your profile folder(it usual c:\Users\*user*\AppData\Roaming\Mozilla\Firefox\Profiles\*something*-default (check date of modified),
Create a new folder named chrome.
Inside the chrome folder, create two new files, userChrome.css and userContent.css.
At the top of userChrome.css, add (copy/paste) the following:

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
/* Hides tab bar*/
#TabsToolbar { visibility: collapse; }

Save it and restart firefox. Enjoy."

That's it, enjoy tree-style without the top tabs.

What can I say: were it not for this addon, I would not be using Firefox. Piro has undertaken a thankless, herculean task to rewrite from scratch a very mature extension using a new, immature API, wrestling with its many limitations, working with Mozilla to extend the API to bring this add-on, and many others, up to more usable levels.

There are many rough edges with this new WebExtensions version of TST, but it would be impossible to penalize Piro for those, as I see just how much effort he his putting into bringing the best possible experience to his users.

WebExtensions or not, TST is utterly indispensable. And it will only get better from here.

(Piro: I understand how demoralizing it must be to get these 1 star reviews from users who don't know any better. Hope you're sufficiently able to ignore them.)

-

ffffffrf

It's a must have! Thanks.

It's just the Firefox 57 upgrade that is a bit hard but it is not the developer's fault! I was just surprised not to see my vertical tabs on the left (even after some FF restarts) until I read that there is a button to display it! Maybe there is a bug or the developer simply forgot to make this visible by default or maybe FF57 does not allow this.

For the upgrade, I had to follow the migration tutorial here: https://github.com/piroor/treestyletab/wiki/How-to-convert-session-information-from-old-TST-0.19.x-to-new-TST-2.x
And then I used the following CSS rule to hide the "standard tab bar on the top": https://github.com/piroor/treestyletab/wiki/Code-snippets-for-custom-style-rules#hide-horizontal-tabs-at-the-top-of-the-window-1349
First I had to created a folder chrome inside my user profile directory, then a new file userChrome.css where I placed the following code:
#TabsToolbar {
visibility: collapse !important;
}
This hides the "standard tab bar on the top" as expected.
Now I finally have TST quite as before, and at least as usefull as before!

Thanks again @Piro and other developers to keep maintaining this add-on!

works great with WebExtensions!

It works great with firefox 57. Almost like in 56 but need to configure it a little bit. Use github instructions to get TreeStyleTab which it was at firefox 56.

На firefox 57 работает практически также как и на 56 с небольшими допилами. Используйте инструкцию на гитхаб чтобы сделать всё как ранеьш.

JHP - Many thanks for referencing the code to remove the horizontal tabs. Can you tell me the name of the 'user profile directory' folder, as I can't find it in Windows Explorer.