Simple, lightweight (87 kb), and useful for quickly navigating around my tabs when I have 20+ tabs open.

I was one of the QA's that tested the original add-on, and I was very sad when Mozilla decided to ditch it from Test Pilot. So when I've found out about yours I got really, really glad. I could not go back to the horizontal tabs anymore.

Thanks for maintaining this add-on, and for quickly fixing everything that it is reported. I really appreciate it!

Hello your last update 2.3.0 actually broke the whole extension on my end, it doesn't adapt to any dark theme anymore and dynamic doesn't work, actually it seems that whatever i choose in the options it doesn't change anything. I was just browsing and it suddenly went white themed with unresponsive settings.
EDIT : I just tried reverting to version 2.2.0 and it works fine so it's definitely the update.

A nice, simple tab sidebar. However, I prefer Tree Style Tab or Sidebery which have more functionality.

It's really good except for one problem - sometimes, dunno why, greyed tabs (unloaded) suddenly turn normal despite when you click on them they need to actually reload. It's annoying because it waste ram. A solution could be marking multiple tabs to unload them.

Edit: I use uBlock origin

With some customizations, it really brings a native look&feel vertical tabs experience.

Handmade and polished. Thank you!