I am having fun with a little side project.
Creating a vertical side panel for Firefox based browsers.
With a small extension managing groups, containers, tabs, search history, bookmarks, tabs, and more.
X11 
old skool.
Mouse and key driven.
I use many browsers for different tasks. And only Firefox based.
So after some testing Zen, I was not happy with zen itself , but the side panel I adapted very quickly.
The future will tell if it’s a useless tool 
Tagged: Unstable not because there are bugs, but there are still new features added.