I tried Sideberry and Tree Style Tabs, this is far better simply for it's handy toolbar at the top and the ability to unload all tabs except for the active one.

Super add-on. The first one I install on any new FF install. For tab-a-holics like me it a must. You can search tabs, jump back and forth, and rearrange from the list.

Been using Tree Tabs for several years without a hitch.

Anyone who does research online and has many research projects running at once likely has dozens if not hundreds of tabs open at any one time. Tree Tabs makes navigating hundreds of tabs easy and manageable.

Some people are saying this app frequently crashes, but it is NOT the case for me on an old laptop running Windows 10.

Firefox is a memory hog, so perhaps having problems are running out of memory? I am using Tree Tabs on an old HP Elitebook G3 laptop with 16GB of RAM and never have a problem with Tree Tabs. On occasion Firefox will bog down to the point of not being usable due to it not freeing up RAM properly, in which case I simply close out of Firefox and restart and all tabs are restored.

TIP: If you are running multiple instances of Firefox (i.e. multiple open windows) and want all the windows reopened upon restart, close all Firefox windows at once by using Windows Task Manager (shortcut Ctrl + Shift + Esc) and select Firefox from the list of Apps and click End Task. This will close all windows at once and when you restart Firefox all windows will reopen.

Tree Tabs add-on makes Firefox one of my favorite browsers (although I prefer Brave for its speed, better memory management, and some privacy features [although Firefox Containers is a plus for privacy]).

Great on Linux, doesn't work on Windows. On Windows, it keeps blinking. I think it keeps reloading that is. Tried on two Windows machines. On Linux it runs fine, except sometimes it forgets the hierarchy/organization of the tabs.

This addon is the only reason for me staying a firefox user after FF 89 update (even earlier on with some mozilla's bad privacy behaviour). I love this addon since it aids me in my research making everything organized. Thank you very very much kroppy for making my life easier!

Crashes about 60% of the time when I try to use the "Close tree" function - I have to to go "Manage Extension" and select "Options", then it comes up with an error that says "A web page is slowing down your browser" and I select "Stop It" to get it working again. Consistently.

Also it'd be really nice to just have the option to have it close tree automatically, but I'll settle for just having the function work without crashing the extension and freezing my browser.

Why can't i open a saved session in private browsing mode?

Fantastico, semplice da usare ma con features molto interessanti (ad esempio vari modi di raggruppare i tabs, possibilità di salvare singoli raggruppamenti nei Bookmarks, o di esportare tutto su file)

problem open/close

MUch better and complete than Tree Style Tab. I the idea of make tab groups , and search tabs with certain URL. Excellente Add-On

This is a truly priceless extension for anyone who uses many tabs and wants to organize them in an exceptionally useful way. Brilliant!

You can see more tabs than in TST and it works well with groups too.

Bravo!

It would be great add only if it will be more stable ... Very often groups are missing or tabs are not in their groups after (re)start of browser :-( Sometimes helps to switch panel into another view and then again to Tree Tabs, but many times I lost the tree structure definitely. Several times all tabs were lost (after firefox update) and addon started a crashed again and again.

Very professionally looking, easy to configure and with tons of options (for those who like to tinker with it more).

Tabs organized as trees, but what's even more interesting, also as folders (for holding nested tabs) and as groups (for holding groups of tabs and folders)!

It's themable, and its theme editor is as thorough as it is easy to use.

Quite a bundle of awesomeness, don't you think?

It's the one I wanted! Group tabs in folder