You can add folders and tab groups, which makes this addon a solid solution for organizing your tabs. Improvement can be won on displaying children in the trees. It is not really clear which ones are child elements of a parent element in the tree. The distance is not big enough. Maybe the use of colours can be a solution for that.

Tab trees no longer break on startup, yay!

However I have the same issue as the last reviewer. After a while new tabs won't display in the tree until you disable then re-enable tree tabs(or firefox).

1.7.6 on latest official firefox release

Excellent, but somewhat bloated if you only want vertical tab without the tree hierarchy. Few issues here and there.

Great addon, the save session (and even group) function is indispensable for me. Every time I launch FF, I need certain tabs open by default. Saving my sessions through this addon lets me load up what I was last working on, and merge in any default tabs that I need. Very good addon, I highly recommend if you want to save your tabs and quickly get back to work. One thing though! This is the only bug I have encountered; The tabs sometimes will stop responding to clicks, and sometimes its not just selecting tabs but specifically moving them (one or the other, though). Simply closing tree tabs, and then clicking on the icon to get it back up fixes the problem. A little annoying but worth the effort since this addon saves me so much time.

Спасибо за последнее обновление! Стало работать гораздо лучше и удобнее.

Однако появился новый баг. Точно описать его пока не могу. Суть в том, что актуальная родительская вкладка может переместиться в предстоящую родительскую при открытии дочерней и так-же переместиться обратно при просмотре дочерней. Сам до конца еще не разобрался

It is the most excellent tree type tab I know.

but i have suggestion.

Mistakes occur in the order of the tabs when using for a long time.
If it is difficult to suppress the occurrence of a mistake, I want a button to synchronize the order of the visible tabs and the order of the tabs recognized by the FF.

After each restart the sidebar appears blank. Resetting to defaults brings it back, but again only until next browser restart. Otherwise very good experience.

Suggestions:
- reverse order option (new tabs at top)
- double click closes tab (if it's even possible in quantum)
- fogging long text instead of triple dot (looks better and cleaner)
- option to completely hide icons bar (search, settings, etc.)

Very good extension!

Can you add Color Tabs Group? Like in Tab Kit?
Color tabs based on their parent: tabs that are related and are part of the same group have the same color

And can you add Unread/Active/Pending Tabs Color/Style too! :)
Thanks! :)

Great extension, thank you.

The main issue I have is when restoring a session (using a different extension), all the group and folder layouts are gone.

I use Tab Session Manager to manage my session as it automatically backs up the session every X minutes + on window close which is essential for my needs. Tree Tabs cannot do this except for manually exporting sessions which is inconvenient in daily use.

Perhaps there is a way to "play nice" with TSM, such as TT automatically saving a history of the group and folder layouts so when restoring my session with TSM, TT can re-group and re-folder what it remembers? The alternative would be to compete with what TSM already does very well and save sessions (I assume sessions also save group/folder layouts) every X minutes and on window close, thus replacing TSM in my case. For me, I prefer to use one group and split it using folders.

The other issue that I've noticed is that when moving a tab to a folder using TT after a TSM session restore, my pinned tabs had their order rearranged. I don't know if other tabs we also rearranged. Who's to blame, I don't know, but I thought to mention it anyway.

Lastly, I'd like to see a "Automatically collapse other trees on expand" option but for folders.

Thank you once again for a fine extension.

I like it so far. Long-time user of Tree Style Tabs and only tried this one because TST now doesn't *replace* the normal tabs, it just adds the vertical ones to the side, leaving the originals in place. Turns out this one does too. Don't see the purpose of adding the vertical tabs if the horizontals can't be removed.

Somewhat disappointed.

I have been looking for a replacement for Tab Groups and this is promising.

However, I have a lot of pages that I refer to, my hope is that someday the developer(s) will add the functionality to open one group at a time so that I don't have to load all them into memory at once. Ideally I would like to start Firefox with no open group then have the ability of opening a group and when shifting to another group all of the tabs I had open would save and close and the chosen group open all tabs. In other words each group of tabs could be loaded separately.

Please fix the tabs dragging from group to group. Sometimes it works normal, but more often I got a tab in separate window.
It's very annoying.

Sad to say that Tree Tabs is less buggy than Piro's "Tree Style Tab."

Although a few navigation bugs make Tree Tabs awkward to use,

1) When the option "Append child tabs to the top" is enabled, Ctrl+Tab|Ctrl+Shift+Tab navigation browses tabs as if "Append child tabs to the bottom" was enabled -- in reverse order.
c.f. Open two tabs from parent, Ctrl+Tab once, the bottom (2nd tab is activated). Ctrl+Tab again, the focus moves UPWARDS (not down) to the first child tab.Ctrl+Tab a third time, focus leaves the tree downwards to the next parent tab.
Expected Behaviour, Ctrl+Tab: 1st child activated, then second child, then leaving tree to next parent tab.

2) When navigating tabs via Ctrl+Tab|Ctrl+Shift+Tab, collapsed trees are expanded and traversed, instead of skipping to the next parent tab.

- Existing unloaded tabs are ignored when saving Tree Tabs session.

- No option to change Tree Tabs font family (perhaps can be rectified with CSS like pre-Firefox 57).

The best vertical tab extension I've found by far. I like it better than Tree Style Tab because it's got tab search and tighter UI. I like it better than All Tabs helper because you can have nested tabs for grouping. My only minor complaint is that when I get enough tabs that I have to scroll, the scrollbar covers the X for closing tabs. Otherwise this is totally awesome.

This is a nice replacement for Tab Groups functionality in pre-FF57. However, I have a couple of issues.

1) Periodically, usually after a FF crash, Tab Groups comes back and has lost all of my tab groups. The tabs are all there, but everything is dumped into the Ungrouped tab group and I have lost all of my organization. Having some sort of "auto save" functionality would be useful, where you can "restore from backup". I know you can save tab groups now, but having that automated would be more practical.

2) When I try to re-order tabs on one of my machines by dragging and dropping within a group, the tab I am moving gets extracted to a separate window when I release the mouse button.

Problem #2 above is a shop-stopper for me, but any help for either of these would be great.

Best tab manager for Firefox!!
But I noticed one annoying behavior - after closing last tab on group, addon changes group to next instead of switching to last tab in group.

I like the basic concept but what I definitiely do miss (based on my experience with other tab group add-ons) is an option to hide the currently not used tabs and tab groups from the browser's tab bar. I even think that such option should be activated by default (to avoid tab proliferation in the tab bar).

Use case example: When I'm in the office, I often have some "not direclty work-related" tabs opened (as probably all of us do). And I do not necessarily want my colleagues to see the titles of those tabs opened in a related group which I call "private". When a colleague steps in and we are working together on something using my screen, I want to show only tabs from the active group which is usually work-related (and have the tabs in the "private" group hidden from the tab bar).

I guess this could be easily achieved by adding an additonal option in the settings "Only show active group in tab bar" or so, where "active group" would be the one selected in the side bar.

UI is friendly. Lot of customisation in the settings, if you're into that. Dev thought of everything. It would be sweet if tabs and groups in the sidebar could resized and color-coded.

Nice.
The groups are awesome too, but 2 suggestions for now:
1) Ctrl-Tabulator should switch the tabs in the order that they are displayed in the sidebar. Right now it happens that by pressing Ctrl-Tabulator a tab in a different group might get activated and that is not useful (but confusing). I think Ctrl-Tabulator should only jump to a tab in the same group and not to a different group.
2) Since Firefox now officially supports tab containers, why not (re-)use these containers in place of the groups? Redundance is never good. And if the groups were containers then they would also be compatible with other add-ons.
Anyway, thx for this nice add-on.

Works very well and allows me to sort projects into their own groups! Thank you very much!

Requests:
• Can you please respect/allow Tab Container coloring on the Vertical tabs? Tab Groups works, but there is no tab coloration to easily see which tabs are in which container!

• Also, can you please enable a "Close tabs below/above (non-trees)" and "Close tabs below/above (in this tree only)"

If these two features are added I would give this a 5-star rating!

We like this app. I like the Tree and Group functionality together. My wife keeps over 1000 tabs up. :)

One problem: On our unit, when you add more than a screen's worth of groups, no up or down arrows appear to allow you to move to groups that are past the screen's view. We use a laptop without a scroll mouse on a normal basis.

(Oh...one other thing. This may not be the add-on, but Firefox tries to make a new window whenever we try to drag and drop within the tree or to a group within the bottom inch or so of the browser. Our sidebar is on the left, and the browser is set to open new windows in tabs.)

Thank you for your efforts!

Love this, sometimes it loses the hierarchy, which is annoying, but it's just so amazing it's still worth 5 stars :D

Sadly I'm having an issue where whenever I drag and drop a tab it opens up in a new window (whether I was moving it in a tree or in a group), was not happening before but now the behavior is the same in all my pcs :C

Thanks for the addon!
Would it be possible to implement keyboard shortcut to switch between tab groups?

Awesome! But the tab order is glitchy (e.g. when ctrl+tabbing through), particularly if I've adjusted the order via drag and drop. Once that's fixed, this will be almost perfect.