Exactly what I needed. Would be great if we could change icon

Would be great if you could set icon to simple "plus" sign

Opens a new TAB and matches the current FF theme. However, it needs Container Support - Can you update it so that CTRL-Click opens a new tab in the CURRENT container? Like the real + button (with the Multi-Account Container installed) which is unfortunately placed all the way at the end of the TAB bar :-(

Easy, simple, and it does its job :-)

Perfect and great after you switch to a vertical tab bar with Sidebery!
Doubleclicking anywhere on Sidebery works well, but on autopilot I am looking for the + sign on the top right area.

The icon is worthless. It should just be a black + sign. What is this tiny green dot?

Спасибо тебе, добрый человек!

Thank you for a very useful add on that is something so basic that Firefox should have included it automatically in their collection of customizable buttons. It's especially useful and almost vital if you've modified Firefox so that the tab bar is hidden when you only on tab open.

So simple, so good!