To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!
CloseWelcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.
CloseDeveloper reply by Tinnyx
Rated 3 out of 5 stars
This is not working like title said, it minimized to open taskbar not tray, so the button "x" is changed to "_", is it possible to change it?
I'm sorry the addon doesn't do what you want, but it does exactly what it's supposed to do.
https://www.computerhope.com/jargon/t/taskbar.htm
What you mean is called "system tray" and it is a subset of the taskbar.
I have no plans on implementing this, but the add-on is open source and you're free to modify it however you want to.
To create your own collections, you must have a Mozilla Add-ons account.