I've been using the Firefox addon called "Tree Style Tab" for quite a few years ...

eropple · on July 19, 2023

I used to use Tree Style Tabs, but I moved to Sidebery a couple years ago and I'm pretty happy with it.

Now somebody else can inform me about the newest one.

muppetman · on July 19, 2023

I love sidebury but how do you cope with two lots of tabs? Do you use tweaks to remove the top line?

kkzz99 · on July 19, 2023

Not OP, but I use tst too and I have around 7000 tabs open. I use a userStyle to hide the sidebar-header like this.

#sidebar-box[sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"] #sidebar-header { display: none; }

botanical · on July 19, 2023

I use Tree Style Tabs with it set to autohide, makes for even more screen space