Used with Firefox Dev build: I really enjoy this add-on. I love the premise. Stability seems iffy: (1) I sometimes observe the parent tab separated from its children, i.e. there will be tabs in between the parent and the child at inconsistent depths; (2) I have observed once in the first few hours of using it the whole sidebar becoming blank and unusable, requiring a restart. I also have one suggestion: I find that this add-on simply supersedes the vanilla browser tab strip, so it would be nice to have an option to hide the default horizontal tab strip.

amazing! please keep it updated!

The best way to organize your tabs! Powerful yet lightweight on system resources.

Ty so much for rewriting this as a webextension!
Performance amazingly now <3

Adds a panel to the left. Background-tab links are opened as tab children. Has drag&drop to move tabs around. Specific display for pinned tabs. Does not hide the tab bar, so right now, I'm using it with full-screen navigation. One of the best tab management add-on, comparable to OneTab.

Makes better use of wide screens and shows more context.

Updated Review: The recent update a day ago resulted in the add-in being unable to load. Agreed, I have a lot of tabs open (approaching 90), but I have plenty of memory and that's why I use this Add-in.
In fact, its why I use FireFox.

Reinstalled v 3.9.22
_______

Been using this for 10 years. My 5 * review from 7 years ago is below.

Please continue supporting this for FF57. It shows up in my FF56 still as being a legacy extension. Like lot of others, it's the reason I use FF. I like being able to drag a group off-pane and creating a new FF window with these tabs present.

My main suggestion for improvement though would be for the new Tabs to appear at the bottom of the list, not as children of a current tab. Swap the current Cntl Click function to creating tabs as child tabs.

It would also be nice if the currently active Tab changed colour to something bright and in yer face. I'm often on screens and lose track of which tab it is from when I wish to close the screen.

Does what it says on the tin, no useless or overcushioned functions. Supports WE, and makes heavy-tab browsing much easier.

What's best is that NO other browser or extension can do this. Only TST can.

Like many other commenters, the possibility of having tabs
1) on the side
2) ordered as a tree
is one of the main draws of Firefox (privacy enhancements and extensions being another).

However, in Firefox 57 on MacOS, the performance with the add-on seems worse than with the native tabs UI, both at startup (when displaying my 100+ tabs) or when I opend many tabs in a short span of time.

The problem could well be due to the WebExtensions API that it uses and not the add-on itself, but it'd be great if you could confirm that you have thought about optimizations, piroor.

But most importantly: thanks for your work! :)

PS: I also had an issue a month ago, not long after upgrading to v57, where the extension would permanently use up a lot of CPU (the load went down as soon as I disabled it, so the causation link was pretty clear). I ended up solving it by saving all my tabs as bookmarks, clearing the tabs, then restoring them: the previous tree must have been "corrupted" in some way.

Tried every setting I could to prevent child tabs from every being closed, but I was still losing tabs when closing *some* parents. Tried promotion, dummy, only when tst is open, etc.

Very nice addon quite useful to manage tabs.

F1 is a nice shortcut ... but I prefer personaly F4 ... is there a way for me to change this somewhere ?

I had a look and found "F1" in the manifest.json ... (opened it with 7zip) ... but changing this just breaks the addon ...
So ... Please, tell me how to do this ...

Great addon but sometimes stops working. A restart will make it work again, but tabs and windows that I'd closed appear again. Real weird. Was fine until latest update, and I'm sure it will be fine again.

When working it's a useful addon and when devs have the ability to hide the top tab strip, we'll get a little vertical space back. Trees are great, too.

This is a great add-on. Gotta love those trees.

Because of that it's also much better than Tab Center Redux.

There is just a little thing missing. Make it so "unloaded" (not unread) tabs are visually distinguishable e.g. gray and italic font.
Maybe it's possible with some css in the advanced section but I couldn't figure out the tag for unloaded/pending tabs.
".tab.pending .label ..." doesn't work apparently

PS: Got it. It's "discarded". So if you want to give unloaded/pending/discarded tabs grey labels use this:
.tab.discarded .label {
color: grey !important;
}

5*

Great tree style tab addon. Maybe the best. One thing that i would changed: ability to close tab tree by middle mouse or by right click in first level of menu(would be much faster than now clicking from sub-menu). Thx for great addon! :-)

Now, in Fx 56.0.1 (at least 64 bit, Win10) the version Tree style tab 0.19.2017090601 is works (show in https://addons.mozilla.org/en/firefox/addon/tree-style-tab/versions/ ). But 2.x.x is "not compatible" yet.

But in Fx Developer Edition (57.0b11) Tree Style Tabs 2.0.8 is works (with new style of tabs by default).