Install this extension now.
Press F1 to toggle the tab sidebar - tabs are a "child" of the tab you opened a tab from. This means your tabs are auto-categorised and you can see the "history" of how you got to a page at a glance.

I was concerned this would no longer be available for FF57, but the author has re-written the extension, leaving it better than ever.

It fits new firefox design :D

Very useful. However too few options. I wish there's a way to one-click sort and group all tabs under same URL.

Great addon, but I wish it had some improvements. The trees are really handy, but when closing a tab, the tab I get moved to sometimes isn't the one right next to what I had open. And I rally wish this allowed you to tag your tabs after already having them open. Having to tag, duplicate, and close is a rather bothersome.

I've been using TST for ages now. I'm glad to see it's made the leap to Firefox 57, and it works really well here. Highly recommended!

Why are changes usually worse?
Why "Reload this tree" is in an additional context menu? It extends the work.

not visually attractive

An essential extension for those who open a lot of tabs. It is especially useful for grouping tabs from various sites.

It would really be helpful if it were possible to disable the tabs at the top of the page.

Well designed, simple, and easy to use. Beautifully integrated into the builtin Sidebars. Tabs are automatically arranged in a hierarchical structure and you can fold and unfold a parent item. I've only started using this minutes ago, but I already love this addon!

great, but now i have tree tab, the orignal tab bar is not nececery now, how can i make it disapear?

It's a very big UI flaw that I can't open my bookmarks or history up along side the tree tabs (as they are both stuck in a single sidebar pane). Please complain to Mozilla about this.

Very useful, clean and light weight. Also, an excellent port to the new firefox infrastructure.

This addon does not restore the tree structure when using official default session restore!!!!!

I just had a crash, and what do I get when I restore my session?
All the nested tabs structure is GONE, all tabs are at the same level, and half an hour of work rearranging the tabs into trees disappeared into nothingness. Great way to lose my time.

Oh and I won't even bother recreating it, since Quantum does not support operations with multiple tabs, so I'll have to arrange tabs one by one. Only to lose everything on the next crash.

Oh and there is no "Search tabs" feature for some reason now, so when I need it I need to switch to another vertical tabs addon, use it there, then switch back to this one.

At this point in time, Tree Tabs is a vastly superior addon - it has tab groups, tab search and tab multiselect - all of these features Tree Style Tab lacks.

Found it pretty good but why does it force-enable tab containers? This adds another item to the context menu with no option to disable.

Great extension - allows for really intuitive organization of tabs.