LM22.1 a Must , especially when you have double right click to close Tab on the Window. for accidental closure of a Tab

This Add-on makes navigating the web so much easier. Thank you!

Hi, unfortunately the addon seems installed but doesn't show anywhere on my Firefox ... I would like to understand why it doesn't and how to fix that ...?
I don't know how to contact the creator of this addon anywhere else than here unfortunately.

HELP ???

Edit : Thanks for the answer, it works perfectly now.

عالییییییییییییییییییییییییی

This extension is a no-brainer. I used the shortcut ctrl+shift+t all the time already. But through this extension, I can just use my mouse. Great and simple!

nice!