Great replacement for Tree Style Tabs. Make sure you add window:not([privatebrowsingmode="temporary"]) #tabbrowser-tabs { visibility: collapse !important; } to a file called userChrome.css in a directory you create called chrome in your Firefox profile directory if you want to get rid of the default tabs.

Used TST years, last night tried Tree Tabs new version on version 57, it is much faster than TST, and lots of customization options. Love it! Fantastic job Kroppy!

Super useful for work when you need to have multiple tabs and want to organize these tabs effectively!

F**k Yeah!
Vertical tabs, groups, and trees! Perfect!

Nice addon !
Testing it alternatively with TST on FF 57b ...
Promising ways to get rid of tabs above ...
Check this script to minimize the tabBar still more ... https://www.reddit.com/r/FirefoxCSS/comments/7512nz/minimized_titlebar_buttons_minimizemaximizeclose/

This replaces everything I used from Tree Style Tabs. Nice work!

Finally a vertical tree style tab manager for FF57.

How do I apply a style once I've changed it? Also please shout once you've fixed the donation link so we can say thank you properly.

Works great, if a bit less featureful than the previous addons. CPU/memory usage is much better though, as is speed. So I'm happy.

Enchancement Request: ctrl tab with clicking on currently active tab. This is a huge time saver, and tree style tabs had it. Huge ergonomic advantage.

I typically have around 250 tabs open in FireFox, and Tree Tabs makes them manageable.

My enhancement request is for "Folders".

A "Folder" is just a dummy tab with a category name on it, into which can be dragged other tabs or trees or sub-folders.

I currently simulate folders by having open, dummy google docs documents, renamed to my desired folder name. Each document is its own tab. So, for example, I can have a google docs document called "STORES" which has a corresponding tab titled "STORES". I drag tabs from Walmart, Target, Home Depot, etc. into the "STORES" tab. Another dummy document called "HEALTH" would provide a tab into which I would drag all of my health-related web pages' tabs.

It would be safer and cleaner, though, to have "folders" implemented directly as part of the Tree Tabs extension.

I like to have my tabs open. Similarly to Steve Gibson of GRC. Although not "quite" as many as that. I regularly would have 70+ tabs open during a day, probably more. Firefox is terrible, scrolling them etc. I need to see my tabs at a glance. This does the job.

Thank you for working on this! FYI - clicking on your PayPal donate link simply takes me to the PayPal homepage :(

Works well and has a decent feature set. Possibility to change colors and plenty context menu options. Has a few bugs though. Some of the sidebar icons don't work. Unfortunately there is no way to hide the default Firefox tab bar until the new web extension API allows something like that.

I would also appreciate it if tabs opened from links in the active tab were treated as children of the active tab. Currently it is possible to attach all new tabs as children of the active tab, but not those opened from links specifically.

Works very well on 64 bit Firefox 54, the sidebar now opens so that issue got fixed. The only problem right now is that, with default settings, when I open new tabs by middle clicking on links on a page, they open at the bottom of the tab list, as if the maximum tree depth is 0 (when it's at the default -1). Setting "append orphan tabs" to "treat as active tab's child" fixes this, but then obviously every tab gets opened as a child of the active one, new tabs, bookmarks, etc. Would appreciate it if you could look at that.