This is the best vertical tab extension. I have disabled horizontal tabs using css so now it looks like it was built in.

I was fighting with tabs for so many years. Constantly having a multitude of open tabs, fearing accidentally closing the window.

I was not very productive, having to scroll and look for tabs all the time.

After making the leap to Tree Style Tab, I got comfortable with vertical tabs, and just recently I made the swift to this, more powerful, version.

There are SO many things to configure. Lots of small tweaks. I loved making the sidebar my very own, even implementing a bit of userChrome.css.

This add-on is extremely powerful, as it's so versatile.

I will never look back from this day!

It would be nice to be able to see "synced tabs" in tab panel.

Been using this for years and don't know what i would do without it. I've tried many alternatives, but Sidebery is the best one for me. The 2 main feature requests i have are:

1: Option to save the automatically created snapshots (backups) to a folder of choice, so i can save it eg. to google drive, both as a remote backup and to possibly share data between devices. I'm currently trying to locate the default snapshot folder, so i can sync that (help appreciated).

EDIT: The following suggestion has now been implemented (thank you so much mbnuqw!) :

2: Key binding option for creating groups. In settings you can set key bindings for virtually anything, so it seems like a mistake that you can't bind one for creating groups. It's the only thing that requires mouse action for my workflow. There's already a thread on the forum.

Easily the best vertical tab manager. Nested tabs, tab re-titling, automatic tab sleeping, tab groups, settings syncing between devices, the list goes on. This almost single-handedly makes Firefox my go-to browser. Keep up the amazing work!

By far the most polished sidebar tabs extension. Make sure to use the userChrome.css dynamic hiding rules when installing it.

Excellent software like this is rare. The priceless value add it brings to my browsing experience aside, the ui, ux, performance, feature set, vision is excellent top to bottom. Someone needs to award this guy.

it's so, so good.

Best thing since sliced bread. I had been using a similar add on for years until recently, Sidebery does everything that it did plus lots more really useful things. Really helps my workflow. Excellent. One slight niggle is that recently it has been randomly moving existing tabs to new windows, seems to be triggered by some browser event but I can't figure out what it is yet.